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7MM Mag Change

Printed From: OpticsTalk by SWFA, Inc.
Category: Firearms, Bows, and Ammunition
Forum Name: Reloading & Ballistics
Forum Description: Anything to do with ammunition
URL: http://www.opticstalk.com/forum_posts.asp?TID=45622
Printed Date: July/11/2020 at 12:07
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com


Topic: 7MM Mag Change
Posted By: SVT_Tactical
Subject: 7MM Mag Change
Date Posted: April/22/2019 at 14:37
Long story short ended up with a Win 70 in 7mm rem mag that has throat erosion so bad it won't shoot for crap.... going to re-barrel and considering options. 
 
Found this list online -
Long actions with a bolt face .Dia of .540 +/-257 Weatherby
264 Win Mag
270 weatherby Mag
7mm Remington Mag
7mm Weatherby Mag
7 STW
7mm Remington Ultra Mag
300 H & H
300 Winchester Mag
300 Weatherby Mag
300 RUM
303 Brit
8mm Remington Mag
338 Winchester Mag
340 Weatherby Mag
338 RUM
375 H & H
375 Weatherby
375 RUM
416 Remington Mag
458 Winchester Mag
458 Lott
 
Now that's probably not inclusive but good start to my pondering.   .
 
I've always said I wanted a rifle that started with a 4 so it got me pondering lol. 
Could the 7mag action really hold up to the 458 Lott pressures?  or is there a special action needed?


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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln



Replies:
Posted By: Rancid Coolaid
Date Posted: April/22/2019 at 14:56
what is barrel length? Have you considered shortening the barrel and getting rid of the problem area?

Were it me, with that gun, I'd go 458WM or 338WM, but more for "want" than for "need."

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Freedom is something you take.
Respect is something you earn.
Equality is something you whine about not being given.


Posted By: Peddler
Date Posted: April/22/2019 at 15:04
How about getting real kinky and trying a 300 or 338 Sherman?

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When you are dead, you don't know you are dead.It is difficult only for others.

It is the same when you are stupid.


Posted By: supertool73
Date Posted: April/22/2019 at 15:08
Would a .416 Rigby fit.  I have always thought that would be a fun caliber to own.    


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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: SVT_Tactical
Date Posted: April/22/2019 at 16:08
Originally posted by Rancid Coolaid Rancid Coolaid wrote:

what is barrel length? Have you considered shortening the barrel and getting rid of the problem area?

Were it me, with that gun, I'd go 458WM or 338WM, but more for "want" than for "need."
 
The 458 WM defiantly has cheaper ammo and may be a better fit for this action... don't know....  even a 375 H&H would be a killer round....


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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: SVT_Tactical
Date Posted: April/22/2019 at 16:09
Originally posted by supertool73 supertool73 wrote:

Would a .416 Rigby fit.  I have always thought that would be a fun caliber to own.    
 
Not sure,  the 416 Remington did pop up too. which I know they are basically the same round but ammo cost seems cheaper on the Remington for some reason at midway.


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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: Peddler
Date Posted: April/22/2019 at 19:58
your going to build something different and then are worried about ammo cost???

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When you are dead, you don't know you are dead.It is difficult only for others.

It is the same when you are stupid.


Posted By: Kickboxer
Date Posted: April/22/2019 at 20:08
The action should be fine going up to .458 WinMag and the Lott actually creates less pressure than the WInMag.  You should go all out and build a "whale rifle" in .460 Weatherby Magnum (.378 Weatherby Magnum necked up to .458 projectile).  If I did not love my Champlin .378 Weatherby Magnum so much, I would have it converted to .460.  Imagine... a .458 500 grain bullet pushed to 2700 + fps.  Makes my hackles rise...  I've shot a number of Lott rounds with 510 grain RNSP at 2400 fps... quite impressive.  It's what I killed the tree with... 

.460 Weaterby Magnum... it's a dream I have...


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Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living


Posted By: Tip69
Date Posted: April/22/2019 at 22:25
Originally posted by Rancid Coolaid Rancid Coolaid wrote:

what is barrel length? Have you considered shortening the barrel and getting rid of the problem area?

Were it me, with that gun, I'd go 458WM or 338WM, but more for "want" than for "need."
 
 
learning/teaching moment.... the throat is at the end of the barrel, near the muzzle?  I always assumed it was by the chamber.


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take em!


Posted By: supertool73
Date Posted: April/22/2019 at 22:28
No. Its at the chamber. You cut off some at the chamber end and then rechamber and thread again. Which also makes it shorter. 

Sometimes its called setting it back as well


-------------
Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: RifleDude
Date Posted: April/23/2019 at 00:06
First things first...what are you planning to use the rifle for? If you just want something different “just because” (which, by the way, I personally consider a perfectly valid reason for building/acquiring a new rifle)...you might stop and think about this for a bit. Your recent history has shown a pattern of impulse firearms purchases, only to end up trying to sell these purchases only a couple months later. Are you really sure you love the action and stock enough to justify the expense of rebarreling? If you don’t have a strong emotional connection to the basic rifle, then I would sell the whole thing and use the money toward something you really like. If you’re gonna go “semi custom,” why not just go the Full Monty and build a full custom rifle? You don’t have to get in a big hurry; just acquire the components over time and build something uniquely yours. It will be a fun project, you can make every part of it exactly as you want with no compromises, and you will be way more proud of the result. 

If you’re just rebarreling a plain ole factory M70, you will never recoup the cost you have in it. The cost to rebarrel when all is said and done will likely be greater than the resale value of the rifle when finished. The only case where I personally see this as worthwhile is if the rifle has sentimental value - a gift from a family member for example - and you’re absolutely certain you will never sell it.


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Ted


Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle.


Posted By: Scrumbag
Date Posted: April/23/2019 at 04:41
375 H&H is longer than the Win Mag / Remington so your action might not be long enough

Scrummy


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Was sure I had a point when I started this post...


Posted By: budperm
Date Posted: April/23/2019 at 06:22
I'm thinking the 7 STW or 7mm Rem Mag.

He's married now with two rats a crawling.  He has the inflicted pain part of his life well covered.... Say What


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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson





Posted By: Bigdaddy0381
Date Posted: April/23/2019 at 06:32
28 Nosler

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P&Z Firearms , Pro gun cleanings and gun repair and wood refinishing.

Ecclesiastes 10:2


Posted By: budperm
Date Posted: April/23/2019 at 06:35
That would work nicely too...

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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson





Posted By: Tip69
Date Posted: April/23/2019 at 08:11
Well said Ted.....   well said indeed!!

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take em!


Posted By: SVT_Tactical
Date Posted: April/23/2019 at 09:39
Originally posted by RifleDude RifleDude wrote:

First things first...what are you planning to use the rifle for? If you just want something different “just because” (which, by the way, I personally consider a perfectly valid reason for building/acquiring a new rifle)...you might stop and think about this for a bit. Your recent history has shown a pattern of impulse firearms purchases, only to end up trying to sell these purchases only a couple months later. Are you really sure you love the action and stock enough to justify the expense of rebarreling? If you don’t have a strong emotional connection to the basic rifle, then I would sell the whole thing and use the money toward something you really like. If you’re gonna go “semi custom,” why not just go the Full Monty and build a full custom rifle? You don’t have to get in a big hurry; just acquire the components over time and build something uniquely yours. It will be a fun project, you can make every part of it exactly as you want with no compromises, and you will be way more proud of the result. 

If you’re just rebarreling a plain ole factory M70, you will never recoup the cost you have in it. The cost to rebarrel when all is said and done will likely be greater than the resale value of the rifle when finished. The only case where I personally see this as worthwhile is if the rifle has sentimental value - a gift from a family member for example - and you’re absolutely certain you will never sell it.
Always the voice of reason........  but I also hate dumping a rifle I know doesn't shoot on anyone and not many people will pay much for a gun with that known issue.... so its damned if you do and damned if you don't kinda situation.  Sure setting it back is cheaper but not sure if it shot well before or not.....


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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: RifleDude
Date Posted: April/23/2019 at 15:34
On the chambering question...unless you plan to make some trips to Africa or hunt brown bear, I wouldn’t chamber in the heavy thumpers. You won’t shoot it very often, it will be expensive to shoot, and there isn’t a real application/need for the “> .338” bore” cartridges anywhere on the continent. It pains me to say that as someone who enjoys owning way more guns than I can practically use, but it’s the truth. 

A couple decades ago, the cartridge chosen and case capacity meant far more than it does today. Back then, you could either choose a tough bullet or a high BC bullet, but not both at the same time. Today, you no longer have to make those trade offs. Advances in bullet technology have made cartridge selection (within reason) almost irrelevant. Today, a typical mid-power “deer rifle” cartridge will drop anything in North America in its tracks as long as you steer the right bullet to the right place.

My advice: stick with something with either 6.5mm, 7mm, .30, or .338 bore diameter and forget the rest. Those are where you will find the greatest variety and best performing selection of bullets that will do it all. Anything else involves too many compromises.


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Ted


Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle.


Posted By: mike650
Date Posted: April/23/2019 at 15:45
Winkle. Wink

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Fish to Live, Live to Hunt


Posted By: supertool73
Date Posted: April/23/2019 at 16:07
What about the 300 PRC?


-------------
Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: RifleDude
Date Posted: April/23/2019 at 17:09
Originally posted by SVT_Tactical SVT_Tactical wrote:

I also hate dumping a rifle I know doesn't shoot on anyone and not many people will pay much for a gun with that known issue.... so its damned if you do and damned if you don't kinda situation.  Sure setting it back is cheaper but not sure if it shot well before or not.....

Set the barrel back and try it. You don’t have much to lose. If it shoots great afterward, keep it and bask in the knowledge that you solved the problem without much coin involved. If it shoots so-so, sell it with the knowledge that it just requires a little load development and TLC to reach its potential. If it shoots like crap, then you weren’t out much money.


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Ted


Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle.


Posted By: Kickboxer
Date Posted: April/23/2019 at 17:30
You are all forgetting... ".458 Lott... guaranteed to knock down anything that walks on the planet".  
That's all it takes...  

Then... there's .458 Express... "with the .458 Express, I could walk up to the gates of Hell, call out Satan, and come home safely..."

Now that I'm handloading again... .458 Express is definitely within my reach.


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Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living


Posted By: Sparky
Date Posted: April/23/2019 at 18:02
Originally posted by RifleDude RifleDude wrote:

Today, a typical mid-power “deer rifle” cartridge will drop anything in North America in its tracks as long as you steer the right bullet to the right place.

What do you consider a mid power deer rifle cartridge?


Posted By: RifleDude
Date Posted: April/23/2019 at 18:26
Everything from 6.5 Creed/7-08/.308 class to 7 Mag/.300 Mag class. It’s all about the bullet chosen for the specific job, not the vessel said bullet is launched from. 

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Ted


Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle.


Posted By: Kickboxer
Date Posted: April/23/2019 at 20:24
If the bullet is insufficient for the task, then it really does not matter what the MV or ME is... product at the point of impact is going to be too much meat destroyed/lost or wounding that will not have the desired end result... meat on the table ethically taken.  The number one "assumption" is that bullet selection will have been performed such that it is equal to the task at the velocity, range and energy at the point of impact.  (Unfortunately, I am dealing with a situation just like that at work right now... armchair/desktop engineering decisions not based upon real knowledge and experience.  It happens.)  We always hope the "homework" is performed properly prior to execution... unfortunately, often not the case. 
The gun matters... it has to be capable of the the accuracy required for POA/POI delivery... the caliber does matter, based upon the game being hunted... there is a difference in "best calibers" for white-tailed deer or for elk or for "griz"...  certainly one can kill most any game with a .22 given proper bullet placement at the proper distance... but, truthfully, I'd rather shoot a charging Cape Buffalo with a .458 Lott or .460 Weatherby Magnum than with a 30-06 (or even a .375 H&H)... but that's just me.  Hydrostatic shock is real...
Proper research, planning, equipment, and execution all go into successful hunting results.
As the Knight's Templar in "Indiana Jones and the Last Crusade" said... "Choose wisely..."


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Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living


Posted By: SVT_Tactical
Date Posted: April/24/2019 at 12:46
Going to check around and see if we have  7mm mag reamer to set the barrel back..... may have to rent it


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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: budperm
Date Posted: April/25/2019 at 07:28
Somebody's got one.....  What about our over-achiever from Georgia?

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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson





Posted By: SVT_Tactical
Date Posted: April/25/2019 at 07:49
Carried to my regular smith last night... he measured and text this morning to say he could set back but saw several areas of damaged rifling down the tube as well.... I had not saw those, stopped inspecting when I saw the throat...... He doesn't think setting back will help much but we could try it......

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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: budperm
Date Posted: April/25/2019 at 07:51
New tube time.....

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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson





Posted By: SVT_Tactical
Date Posted: April/25/2019 at 09:35
that or just eat the loss and leave it in the back of the safe until I decide better

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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: supertool73
Date Posted: April/25/2019 at 10:12
You could get an ER shaw barrel for under $200 if u wanna keep it cheap

-------------
Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: mike650
Date Posted: April/25/2019 at 10:16
A build for the kids.

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Fish to Live, Live to Hunt


Posted By: budperm
Date Posted: April/25/2019 at 11:50
Sounds like a wonderful gift for that person you really don't like...... Cool

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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson





Posted By: budperm
Date Posted: April/25/2019 at 11:50
Will I have to pay for the shipping too????



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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson





Posted By: SVT_Tactical
Date Posted: April/25/2019 at 11:57
BP.... won't do you any good... it don't shoot acceptable for hunting!  3 shots you can cover with poster of your latest centerfold model..........

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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: Bigdaddy0381
Date Posted: April/25/2019 at 13:31
pie plate? 

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P&Z Firearms , Pro gun cleanings and gun repair and wood refinishing.

Ecclesiastes 10:2


Posted By: budperm
Date Posted: April/25/2019 at 14:35
when all else fails......  rain lead....

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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson





Posted By: Kickboxer
Date Posted: April/25/2019 at 17:43
A rate of fire of several thousand rounds per minute has a positive impact on large dispersion...

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Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living


Posted By: bugsNbows
Date Posted: April/26/2019 at 06:28
How about a 7MM Dakota? That's something a little different.

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If we're not suppose to eat animals...how come they're made of meat?
               Anomymous


Posted By: SVT_Tactical
Date Posted: April/26/2019 at 07:59
Originally posted by Bigdaddy0381 Bigdaddy0381 wrote:

pie plate? 
yeah but that's not sufficient for huntin' IMO


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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: budperm
Date Posted: April/26/2019 at 10:55
agreed, not ethical to use except maybe of hogs and Dumocrats...   Cool
 


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"Peace is that brief glorious moment in history when everybody stands around reloading".
--Thomas Jefferson





Posted By: Bigdaddy0381
Date Posted: April/26/2019 at 13:05
It is if your hunting a plate to put some pie on... Just saying,,lol


I vote 28 nosler and be done with it.


Originally posted by SVT_Tactical SVT_Tactical wrote:

Originally posted by Bigdaddy0381 Bigdaddy0381 wrote:

pie plate? 
yeah but that's not sufficient for huntin' IMO


-------------
P&Z Firearms , Pro gun cleanings and gun repair and wood refinishing.

Ecclesiastes 10:2


Posted By: RifleDude
Date Posted: April/26/2019 at 18:12
if you’re re-tubing anyway, .28 Nosler would be cool.

-------------
Ted


Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle.


Posted By: supertool73
Date Posted: April/26/2019 at 22:35
6.5 prc. Or maybe 7.6 creedmoor

-------------
Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: RifleDude
Date Posted: April/26/2019 at 22:46
Originally posted by supertool73 supertool73 wrote:

6.5 prc. Or maybe 7.6 creedmoor

Both nice rounds, but 6.5 PRC is a short action round and 7.6 Creedmoor won't work because he has a .534" magnum bolt face and 7.6 Creed has standard .473" case rim.


-------------
Ted


Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle.



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