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Rifles, Reloading, Optics, Equipment
Reloading
Please help: Question regarding pressure signs, barrel breaking in?
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<blockquote data-quote="Bassnbow" data-source="post: 2556127" data-attributes="member: 74644"><p>Thanks to everyone trying to help. Just to clarify these loads were exactly the same with brass with the same number of firings. I originally fire formed my 100 pieces of Pettersen brass 1 time, then annealed and sized bumping shoulder back just enough to chamber smoothly. I then loaded and fired the original mentioned groups that were very accurate with the first half of that brass. I then loaded the second set of rounds using some of the remaining brass (still once fired). This was when I saw slight pressure signs and increased velocities from the same loads as the last session. I did purposely load some of the rounds hotter than the first session, but I didn't end up shooting those because of the pressure signs. </p><p></p><p>This was one of the reasons I was so surprised to see pressure/velocity increases, because the brass was the same in both sessions. Obviously as some of you noted it is likely the barrel which is changing/stabilizing that is causing the increase. </p><p></p><p>This brass is 280AI brass and I was aware that it really isn't completely fireformed until fired 2-3 times, but with components what they are I was hoping to conserve. </p><p></p><p>I did not neck turn the the brass, but it feels very consistent when seating bullets. I also have a bore scope and will check for a carbon ring and some of you noted. I think I'm very fortunate the barrel is obviously a shooter and I won't have any trouble finding a sub .5 load when barrel and brass settle in. Guess I need more patience, LOL</p></blockquote><p></p>
[QUOTE="Bassnbow, post: 2556127, member: 74644"] Thanks to everyone trying to help. Just to clarify these loads were exactly the same with brass with the same number of firings. I originally fire formed my 100 pieces of Pettersen brass 1 time, then annealed and sized bumping shoulder back just enough to chamber smoothly. I then loaded and fired the original mentioned groups that were very accurate with the first half of that brass. I then loaded the second set of rounds using some of the remaining brass (still once fired). This was when I saw slight pressure signs and increased velocities from the same loads as the last session. I did purposely load some of the rounds hotter than the first session, but I didn't end up shooting those because of the pressure signs. This was one of the reasons I was so surprised to see pressure/velocity increases, because the brass was the same in both sessions. Obviously as some of you noted it is likely the barrel which is changing/stabilizing that is causing the increase. This brass is 280AI brass and I was aware that it really isn't completely fireformed until fired 2-3 times, but with components what they are I was hoping to conserve. I did not neck turn the the brass, but it feels very consistent when seating bullets. I also have a bore scope and will check for a carbon ring and some of you noted. I think I'm very fortunate the barrel is obviously a shooter and I won't have any trouble finding a sub .5 load when barrel and brass settle in. Guess I need more patience, LOL [/QUOTE]
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Please help: Question regarding pressure signs, barrel breaking in?
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