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What to do with these projectiles?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/07/2018 at 17:59
alamo308 View Drop Down
Optics GrassHopper
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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?
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/11/2018 at 00:26
alamo308 View Drop Down
Optics GrassHopper
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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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/11/2018 at 09:11
BeltFed View Drop Down
Optics God
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Do you have a 7.62x54R? I think their diameter is actually .310.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/11/2018 at 12:27
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Optics GrassHopper
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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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/11/2018 at 13:05
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Optics God
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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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/11/2018 at 13:26
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Optics Master
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Also .303 Brit would do nicely for that I think...
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