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<blockquote data-quote="sp6x6" data-source="post: 500758" data-attributes="member: 21869"><p>I searched this thread and confirmed, I have donuts. How do I avoid and fix, saw the neck turning,remening inside. My situation,338 nm, 15 cases, took a few up to pressure signs. I had no shoulder bump gauge, do now. with .420 bushing, case&nbsp; lengths new brass 4.068-.070.Fired 5x- 4.076 some hot. I was sizing to 4.072, this seemed like what I HAD TO DO to close bolt, pulled spring. I was trying to shot 285 hornady and noticed that when I used a .375 coparator bushing, my length grew .005. This was checking right at neck and shoulder. The hornady seated past this point, where the long berger boattail missed this junction. N ow the berger bottoms on the donut of the just fired cases. At 4.072 I could load berger but not hornady without tight bolt i also have been seeing pressure, which I should be under load. 86.5 gr retumbo 2670 vel.300 hyb. fed215.took it to 90 retumbo2790 vel.help please</p></blockquote><p></p>

[QUOTE="sp6x6, post: 500758, member: 21869"] I searched this thread and confirmed, I have donuts. How do I avoid and fix, saw the neck turning,remening inside. My situation,338 nm, 15 cases, took a few up to pressure signs. I had no shoulder bump gauge, do now. with .420 bushing, case lengths new brass 4.068-.070.Fired 5x- 4.076 some hot. I was sizing to 4.072, this seemed like what I HAD TO DO to close bolt, pulled spring. I was trying to shot 285 hornady and noticed that when I used a .375 coparator bushing, my length grew .005. This was checking right at neck and shoulder. The hornady seated past this point, where the long berger boattail missed this junction. N ow the berger bottoms on the donut of the just fired cases. At 4.072 I could load berger but not hornady without tight bolt i also have been seeing pressure, which I should be under load. 86.5 gr retumbo 2670 vel.300 hyb. fed215.took it to 90 retumbo2790 vel.help please [/QUOTE]

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