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Rifles, Reloading, Optics, Equipment
Reloading
243 Win Backing Out Primers
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<blockquote data-quote="AZShooter" data-source="post: 1233069" data-attributes="member: 5219"><p>You say you are using mild loads. IMO the primers LOOK like you have excessive pressure because their shape has been altered by the primer backing out of the primer pocket during combustion. A bit later the pressure causes the case to move rearward against the bolt face flattening the primer which is sticking out of the case head. The case head is not held against the bolt face due to forward movement of the case by the firing pin. As others have mentioned this is excessive headspace. </p><p></p><p>Have you shot any once fired brass? If the brass is sized with minimal setback of shoulder the case should maintain contact with the bolt face preventing the flattening of the primer. If issue disappears it is excessive headspace. </p><p></p><p>Have you tried seating a bullet to engage the rifling? That would eliminate the headspace issue keeping the case head against the bolt face. </p><p></p><p>Try some changes and let us know. This is what this forum is all about, sharing information.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1233069, member: 5219"] You say you are using mild loads. IMO the primers LOOK like you have excessive pressure because their shape has been altered by the primer backing out of the primer pocket during combustion. A bit later the pressure causes the case to move rearward against the bolt face flattening the primer which is sticking out of the case head. The case head is not held against the bolt face due to forward movement of the case by the firing pin. As others have mentioned this is excessive headspace. Have you shot any once fired brass? If the brass is sized with minimal setback of shoulder the case should maintain contact with the bolt face preventing the flattening of the primer. If issue disappears it is excessive headspace. Have you tried seating a bullet to engage the rifling? That would eliminate the headspace issue keeping the case head against the bolt face. Try some changes and let us know. This is what this forum is all about, sharing information. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
243 Win Backing Out Primers
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