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General >> Ammunition, reloading, shooting, etc >> Cast bullet question
http://www.kragcollectorsassociation.org/cgi-bin/yabb2/YaBB.pl?num=1511761443 Message started by Culpeper on Nov 27th, 2017 at 5:44am |
Title: Re: Cast bullet question Post by madsenshooter on Jan 15th, 2018 at 6:18pm
I noted that these 311284s came out to be about the same weight as the 311365s that I tried shooting at Camp Perry a few years back. So, I found some Quickload data for a 30" barreled Krag that BadgerEdd had worked up for me, the goal of which was to get 2150fps from a 203gr cast bullet. I had too much lead in the alloy with the 311365 weighing in at 203, but these 311284s are cast of a much stronger alloy. I guess we'll see whether or not there's truly a loss of accuracy above 1700-1800fps with the 311284, or if it's more a matter of the alloy the caster has used not being capable of handling the higher velocity.
38gr of 760, fired with a CCI #34 primer, since they're designed to fire ball powders used in the 7.62x51. Bullets were seated out to the rifle's throat, some of which I feel I washed away shooting high nitroglycerin powders. I see four little rifling marks on the .302" borerider and a mark where the .311" upper band is just touching the conical throat. This is at an OAL of 3.117". I decided to seat to 3.1" for the sake of magazine and charger function and to leave a little room in case I need to unload a round. Edd's data estimates 30,259psi chamber pressure. With a pressure of 5109psi remaining at bullet exit. I've still not found my RL19! |
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