If Im reading this right you dont find anything that shoot well until you get off jam at least .015"? Do you know how far in the lands your typical hard jam is? Have you seen this with long bullets or is this based only on sr br type bullets? Thanks!
Alex, with the neck tension I normally use with my 6mm boat tail bullets, which I describe as medium, 'hard jam' pushes the bullet .020, sometimes .025 into the lands after touch.
I don't use any bullet longer than 68 grain boat tails which are made on .825 J-4 jackets. I have no experience with the longer, heavier bullets used in 600 and 1000 yard matches.
Perhaps Bart Sauter will chime in and tell us where he seats his long range bullets. He is shooting extremely well this year.
Later,
Gene Beggs