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What to do with these projectiles?

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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=45088
Printed Date: July/05/2020 at 12:10
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Topic: What to do with these projectiles?
Posted By: alamo308
Subject: What to do with these projectiles?
Date Posted: September/07/2018 at 17:59
Cleaning out my ammo bunker, I found an unmarked Ziploc bag of about 500 hollow-point boat-tail projectiles. Caliper sized at .31 diameter, weight exactly 175gr., copper jacket, no steel content. They look exactly like SMKs. 
Is there any way to tell what they are for real, or should I just relegate them to plinking?
Question



Replies:
Posted By: alamo308
Date Posted: September/11/2018 at 00:26
Stumped everyone, eh? Confused
I think what I'll do is melt down the whole pile and make a nice artistic doorstop.
Just kidding. LOL
Actually, I came up with a plan which is so simple I'm amazed no one else thought of it:
  1. Make up a batch of ten rounds using 'known' 175gr SMKs.
  2. Make up another batch of ten rounds using the 'mystery' projectiles, using same case, primer, charge, and seating depth as #1, above.
  3. Shoot and chronograph the 20 rounds, in separate batches.
  4. Compare velocity, SD, group sizes, etc.
  5. If results of the two different batches are same or very close, conclude the mystery projectiles are indeed SMKs.
  6. If results of the mystery batch are significantly different from the known SMKs, with widely varying velocity, SD, group sizes, etc., relegate them to plinking ammo only.


Posted By: BeltFed
Date Posted: September/11/2018 at 09:11
Do you have a 7.62x54R? I think their diameter is actually .310.


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Life's concerns should be about the 120lb pack your trying to get to the top of the mountain, and not the rock in your boot.


Posted By: alamo308
Date Posted: September/11/2018 at 12:27
Good suggestion. 
However, I replaced the dying battery in my digital caliper, and the mystery projectile now shows at .3085", same as measuring an SMK 175gr HPBT from an original Sierra box. And interestingly, same as a milsurp 7.62x54R round, that I had on hand, measures with the same caliper.
- - -
BTW: According to Lyman reloading manual, the 'standard' 7.62x54R projectile is typically .3105, although it's not uncommon for a 7.62x54R rifle to shoot a .308 projectile very nicely.


Posted By: BeltFed
Date Posted: September/11/2018 at 13:05
Wow, what a find, 500 .308,175gr. SMK.

A few years ago I bought some mil. surp. .308, 175gr SMK bullets that had been pulled with very light pull marks if any marks at all. They were crazy cheap compared to new, and shot just as good if not better.


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Life's concerns should be about the 120lb pack your trying to get to the top of the mountain, and not the rock in your boot.


Posted By: Scrumbag
Date Posted: September/11/2018 at 13:26
Also .303 Brit would do nicely for that I think...


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



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