Gentleman I have a question. I have a beautiful older Brooks mould. It casts a .410 size 410 gr. (Is that not weird... ) bullet with 30/1 mix. Now....my Sharps #3 in 40-65 has a .408 bore. I really tricked yall.. ...this is a two part question. I have heard both sides of the fence...shoot .001-.002 over bore size...and shoot bore size bullets. Which is best? Secondly...can I size the .410 down to .408 in my Lyman lube/sizer without disturbing the bullet so much that I loose accuracy? Thanks so much for any input. It will be greatly appreciated.
Iron Horse
AKA: Larry Gilley
Bullet Size Help!!!!
- Iron Horse
- Posts: 239
- Joined: Mon Dec 29, 2003 8:42 pm
Bullet Size Help!!!!
Life isn't about waiting for the storm to pass...
It's about learning to dance in the rain.
It's about learning to dance in the rain.
- deerhuntsheatmeup
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My best results...
I got good results lube sizing to .410, that's right, just lube, no sizing, I was using a Lyman Snover, cast 20-1, weighing about 422 grns. Also, the gun was a LRE with heavy oct 30" barrel. Shot well, Good Luck, David Barfield
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Kirk's recommendation is to shoot a bullet that is groove diameter size. That is also the recommendation of Steve Brooks, one of the top mould makers and champion master class BPCR shooter. I look at that as being the ideal bullet size. Paul Matthews in his books on casting says he gets excellent accuracy with bullets 1 thousandth or more under groove diameter, with 30-1, as it 'bumps up' to seal. The negative that oversize bullets present, according to Kirk, is potential chambering problems in fouled barrels, and possibly more of a tendency to lead. Sizing 2 thousandths shouldn't be a problem .. the barrel will do it eventually .. so it's probably better to do it in a sizing die for controllable concentricity.
Good shootin.
Good shootin.