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Hunting
Long Range Hunting & Shooting
Bolt sticks on extraction - could it be carbon build-up?
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<blockquote data-quote="emp1953" data-source="post: 2867496" data-attributes="member: 71817"><p>Any rounds that I put into a good rifle, I do all the work on the brass. Unless it is a crap rifle and all I want to do is make noise on 4th of July.</p><p>Chamber a new round or a good one that chambers easily.</p><p>With a dial caliper measure the distance from the bottom of the case to the start of the shoulder on both cases. They should be very close to the same .001 or so difference is ok.</p><p>If you trim the cases do you remove the burr that always occurs on the inside and outside of the case neck.</p><p>Using dirty cases with dirty necks will cause the following. The case expands upon firing. The neck expands and seals the chamber so no gases migrate between the case and chamber. If the case is dirty enough it will not seal and excessive carbon buildup will occur in the chamber. The brass will expand against that carbon build up and will stick. Use a good bore cleaner on the chamber or have someone with a borescope look at the chamber for you. There is probably carbon there. After it is removed cases should not stick anymore. But..... because of using dirty cases the carbon buildup will return, with a vengence and it will be a merry go round. I advise cleaning the cases, put the extra work into it. Do everything you can to insure the best round that you can create every time. That way when something goofy starts happening you have fewer possible causes to look at.</p></blockquote><p></p>
[QUOTE="emp1953, post: 2867496, member: 71817"] Any rounds that I put into a good rifle, I do all the work on the brass. Unless it is a crap rifle and all I want to do is make noise on 4th of July. Chamber a new round or a good one that chambers easily. With a dial caliper measure the distance from the bottom of the case to the start of the shoulder on both cases. They should be very close to the same .001 or so difference is ok. If you trim the cases do you remove the burr that always occurs on the inside and outside of the case neck. Using dirty cases with dirty necks will cause the following. The case expands upon firing. The neck expands and seals the chamber so no gases migrate between the case and chamber. If the case is dirty enough it will not seal and excessive carbon buildup will occur in the chamber. The brass will expand against that carbon build up and will stick. Use a good bore cleaner on the chamber or have someone with a borescope look at the chamber for you. There is probably carbon there. After it is removed cases should not stick anymore. But..... because of using dirty cases the carbon buildup will return, with a vengence and it will be a merry go round. I advise cleaning the cases, put the extra work into it. Do everything you can to insure the best round that you can create every time. That way when something goofy starts happening you have fewer possible causes to look at. [/QUOTE]
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Bolt sticks on extraction - could it be carbon build-up?
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