I was doing some reloading recently for both my 30-06s and my 300 Win Mag.
I found an old box of 300 Win Mag brass that I put aside years ago. One brass had "failed", case head separation on extraction. It was the 16th loading on that brass!
I generally neck size, and only FL size after 4 or 5 loadings. The failure was after a Full Length sizing.
When I full length size that round, the brass seems to get worked too much.
When I neck size only for my Ruger American Rifle in 30-06, my group sizes drop by over 1/2" (to about 1/2").
My 300 Win Mag (a Bicentennial Ruger M-77) used to shoot 5/8" groups at 100 yds, but it has a lot of rounds through it, and now I'm happy if I can keep it under 1.5".
Best accuracy is with the bullets seated longer than what will fit in the magazine. I'm working on finding a different profile bullet to use under the first bullet that will feed and still shoot well if follow up shots are needed. (The non tipped bullets are shorter)
I found an old box of 300 Win Mag brass that I put aside years ago. One brass had "failed", case head separation on extraction. It was the 16th loading on that brass!
I generally neck size, and only FL size after 4 or 5 loadings. The failure was after a Full Length sizing.
When I full length size that round, the brass seems to get worked too much.
When I neck size only for my Ruger American Rifle in 30-06, my group sizes drop by over 1/2" (to about 1/2").
My 300 Win Mag (a Bicentennial Ruger M-77) used to shoot 5/8" groups at 100 yds, but it has a lot of rounds through it, and now I'm happy if I can keep it under 1.5".
Best accuracy is with the bullets seated longer than what will fit in the magazine. I'm working on finding a different profile bullet to use under the first bullet that will feed and still shoot well if follow up shots are needed. (The non tipped bullets are shorter)