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Pressure question?
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<blockquote data-quote="Casey Napier" data-source="post: 133458" data-attributes="member: 6213"><p>Got a question about what is happening during load developement of my 300SAUM Sendero. The powder that shows great accuracy out of my factory rifle is Varget, shooting in the .6's or better with 59, 59.5 and 60 grains.</p><p></p><p>My question is that I am seeing some very slight cratering in the primers with 59.5 and 60 grains, not every shot, but usually on the 3rd shot of a 3 shot group, each shot fired back to back. No sticky bolt, or flattened primers. The first shot, from a cool bore, shows no sighn of pressure(no cratering) the second shows a slight amount, and the 3rd shows slightly more. Why does it do this? (chamber heat?) </p><p></p><p>This gun will only be used for whitetail hunting, where it will be shot seldom, and from a cool barrel. Will the slight cratering, with no other pressure sighns be okay? I also had this problem with a 7MM Ultra Mag, sent the bolt off to Holland and had the bolt bushined and firing pin turned to match. This solved the problem on the 7MMUM.</p><p></p><p>Thanks </p><p>RidgeRooster</p></blockquote><p></p>
[QUOTE="Casey Napier, post: 133458, member: 6213"] Got a question about what is happening during load developement of my 300SAUM Sendero. The powder that shows great accuracy out of my factory rifle is Varget, shooting in the .6's or better with 59, 59.5 and 60 grains. My question is that I am seeing some very slight cratering in the primers with 59.5 and 60 grains, not every shot, but usually on the 3rd shot of a 3 shot group, each shot fired back to back. No sticky bolt, or flattened primers. The first shot, from a cool bore, shows no sighn of pressure(no cratering) the second shows a slight amount, and the 3rd shows slightly more. Why does it do this? (chamber heat?) This gun will only be used for whitetail hunting, where it will be shot seldom, and from a cool barrel. Will the slight cratering, with no other pressure sighns be okay? I also had this problem with a 7MM Ultra Mag, sent the bolt off to Holland and had the bolt bushined and firing pin turned to match. This solved the problem on the 7MMUM. Thanks RidgeRooster [/QUOTE]
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