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Rifles, Reloading, Optics, Equipment
Reloading
bullet seating depth & high pressures
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<blockquote data-quote="woods" data-source="post: 335905" data-attributes="member: 6042"><p>Okay, a bullet should drop into the case or you don't have enough neck clearance. The case neck should expand to the chamber neck walls and provide clearance for the bullet to exit. Now at the pressures in the chamber the brass is not going to be a major hindrance to bullet exit, but it will have some effect if the brass does not expand clear.</p><p></p><p>It is puzzling though that your loaded round OD is .258" which is smaller than your fire formed size of .2605". You should have .0025" clearance around the neck when you subtract those 2. Recheck that .258". </p><p></p><p>Question: Does the bullet go partway in the neck and hang up at the neck/shoulder junction?</p><p></p><p>If your chamber neck was reamed to .261" (allow a little for springback) then the math would be:</p><p></p><p>.261"-.224"(bullet diameter) = .037"</p><p>.037"-.003"(recommended neck clearance on loaded round) = .034"</p><p>.034"/2 = .017" neck thickness each side</p><p></p><p>Question: Do you have a good way to measure neck thickness, i.e. a ball micrometer?</p><p></p><p>If you are not getting any other signs of pressure then that means the chances are increased that it is a mechanical problem and not a powder load problem. A primer will reseat flush with the case head after firing and that is completely normal, it would be abnormal if it did not.</p><p></p><p>It is possible that if you outside neck turned the neck to a thickness that would allow the bullet to drop into a fired case, then you would be able to work back up on your powder loads for more velocity.</p></blockquote><p></p>
[QUOTE="woods, post: 335905, member: 6042"] Okay, a bullet should drop into the case or you don't have enough neck clearance. The case neck should expand to the chamber neck walls and provide clearance for the bullet to exit. Now at the pressures in the chamber the brass is not going to be a major hindrance to bullet exit, but it will have some effect if the brass does not expand clear. It is puzzling though that your loaded round OD is .258" which is smaller than your fire formed size of .2605". You should have .0025" clearance around the neck when you subtract those 2. Recheck that .258". Question: Does the bullet go partway in the neck and hang up at the neck/shoulder junction? If your chamber neck was reamed to .261" (allow a little for springback) then the math would be: .261"-.224"(bullet diameter) = .037" .037"-.003"(recommended neck clearance on loaded round) = .034" .034"/2 = .017" neck thickness each side Question: Do you have a good way to measure neck thickness, i.e. a ball micrometer? If you are not getting any other signs of pressure then that means the chances are increased that it is a mechanical problem and not a powder load problem. A primer will reseat flush with the case head after firing and that is completely normal, it would be abnormal if it did not. It is possible that if you outside neck turned the neck to a thickness that would allow the bullet to drop into a fired case, then you would be able to work back up on your powder loads for more velocity. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
bullet seating depth & high pressures
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