Over size bullet

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Over size bullet

Post by varsity07840 » Thu May 16, 2019 5:52 am

My .50-70 Sharps has a .510 groove barrel that I normally shoot .512 dia. bullets through. I have another mould that is .518 that I'd like to try but I rather not size smaller than .517 without thinning out the grease grooves too much. Is there any harm in trying them at .517 in .510 grooves?

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Re: Over size bullet

Post by rgchristensen » Thu May 16, 2019 6:15 pm

If you lube the bullets before sizing, the grooves will not close up. I have sized 40 cal bullets down from 410 or a little bigger, to .4005 for a ML rifle, and shot 2 5-shot groups that you could cover with a quarter.


bruce m
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Re: Over size bullet

Post by bruce m » Fri May 17, 2019 9:54 pm

if you can chamber a loaded round containing a 0.517" cast bullet, there will be no safety concern firing it if using black powder.
you do not say whether the sharps is original or replica.
the throat/transition in an original might well be different than a replica?
whatever, if you can chamber a round with that diameter bullet, a lesser diameter bullet will bump up to fill whatever space is there to fill before it starts to move.
in that case a bigger bullet will just save a lot of bumping up which can hurt accuracy.
leading could come if the nose of the bullet is similarly big.
ventum est amicus meus

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Re: Over size bullet

Post by bobw » Tue May 21, 2019 7:40 am

Use the right mold #515141 Lyman and be done with it. There are more than a few guys who have original conversion guns that require a large diameter mold like that. You should be able to get all your money back and then some on it to the right guy. bobw

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