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Blocked bolt with reloaded ammo
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<blockquote data-quote="Calvin45" data-source="post: 1616090" data-attributes="member: 109862"><p>Definitely sounds like an overpressure load (especially as you've stated the cartridges feed, chamber, and extract without any resistance). What cartridge, projectile, powder and charge weight have you loaded? Things that can cause excessive pressure other than an overmax charge or an inappropriate powder can include seating the bullet too far out (or at least closer to the lands than the load referenced in your manual - can make a huge difference - I've blown primers as a rookie using loads that were just under max recommend but with the projectile kissing the rifling as opposed to standard COAL). Are your cases trimmed to correct length? If the neck has grown (through multiple firings and resizings) past the standard maximum case length, upon chambering the round the neck can effectively crimp, and this can and does (again, learned this the hard way) cause pressures to spike (though you'd think it would also make the cartridge notably resistant to chamber and extract). Different brass manufactures can in some cases vary significantly regarding internal volume. I've experienced this with my .270, that max loads in Winchester brass are over max with federal brass. Are you using the same case as what the load data you're referencing did? Are you starting where they start or starting at closer to max? No judgment or anything, to be honest if I'm not after crazy accuracy I often do just load a grain under book max and have yet to have trouble but it's worth ruling out here. Finally, is the projectile in question the same as what was used in the load data you're referencing? Some new reloaders aren't aware that bullet weight isn't the same thing as bullet interchangeability: bearing surface and jacket thickness affect pressure greatly. For example, in a .300 win mag I used to own, I loaded less powder behind a 200 grain woodleigh weldcore than I did behind a 208 grain hornady hpbt. The second projectile is 8 grains heavier but has a much shorter bearing surface and a much thinner jacket.</p></blockquote><p></p>
[QUOTE="Calvin45, post: 1616090, member: 109862"] Definitely sounds like an overpressure load (especially as you’ve stated the cartridges feed, chamber, and extract without any resistance). What cartridge, projectile, powder and charge weight have you loaded? Things that can cause excessive pressure other than an overmax charge or an inappropriate powder can include seating the bullet too far out (or at least closer to the lands than the load referenced in your manual - can make a huge difference - I’ve blown primers as a rookie using loads that were just under max recommend but with the projectile kissing the rifling as opposed to standard COAL). Are your cases trimmed to correct length? If the neck has grown (through multiple firings and resizings) past the standard maximum case length, upon chambering the round the neck can effectively crimp, and this can and does (again, learned this the hard way) cause pressures to spike (though you’d think it would also make the cartridge notably resistant to chamber and extract). Different brass manufactures can in some cases vary significantly regarding internal volume. I’ve experienced this with my .270, that max loads in Winchester brass are over max with federal brass. Are you using the same case as what the load data you’re referencing did? Are you starting where they start or starting at closer to max? No judgment or anything, to be honest if I’m not after crazy accuracy I often do just load a grain under book max and have yet to have trouble but it’s worth ruling out here. Finally, is the projectile in question the same as what was used in the load data you’re referencing? Some new reloaders aren’t aware that bullet weight isn’t the same thing as bullet interchangeability: bearing surface and jacket thickness affect pressure greatly. For example, in a .300 win mag I used to own, I loaded less powder behind a 200 grain woodleigh weldcore than I did behind a 208 grain hornady hpbt. The second projectile is 8 grains heavier but has a much shorter bearing surface and a much thinner jacket. [/QUOTE]
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Blocked bolt with reloaded ammo
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