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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Reloading for Gas Guns?
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<blockquote data-quote="Bart B" data-source="post: 800738" data-attributes="member: 5302"><p>Regarding slamfires in M1 and M14 rifles, I've seen a couple dozen or so cases from them that slamfired. Every one had a full, normal, full depth dimple in them. No M1 nor M14 floating firing pin will do that to any primer made in the USA. All primers made in the USA need about .020" dimple depth to fire them according to an engineer whose worked at arsenals deep in such fields of ammunition issues. And firing pin tips need to protrude at least .060" from the bolt face to fire primers consistantly good. Therefore, I feel the hammer's sear engagement was too small to survive the mechanical shock of the bolt slamming into battery as it chambered a fresh round. Or, some foriegn body jammed the firing pin in the bolt and held it there as it closed on the chambered round.</p><p></p><p>Regarding accuracy with semiautos..... Few have had their bolt faces squared up with the barrel's chamber axis. This is the reason military teams shooting top scores with new ammo (arsenal and commercial match stuff) could never get reloaded cases from them to shoot accurate in their M1 and M14 platforms. Same thing for AR platforms. Those fired cases had their heads press way out of square and resizing them did not square them back up. So, unless your AR's bolt face gets squared up properly, new cases will probably produce best accuracy.</p></blockquote><p></p>
[QUOTE="Bart B, post: 800738, member: 5302"] Regarding slamfires in M1 and M14 rifles, I've seen a couple dozen or so cases from them that slamfired. Every one had a full, normal, full depth dimple in them. No M1 nor M14 floating firing pin will do that to any primer made in the USA. All primers made in the USA need about .020" dimple depth to fire them according to an engineer whose worked at arsenals deep in such fields of ammunition issues. And firing pin tips need to protrude at least .060" from the bolt face to fire primers consistantly good. Therefore, I feel the hammer's sear engagement was too small to survive the mechanical shock of the bolt slamming into battery as it chambered a fresh round. Or, some foriegn body jammed the firing pin in the bolt and held it there as it closed on the chambered round. Regarding accuracy with semiautos..... Few have had their bolt faces squared up with the barrel's chamber axis. This is the reason military teams shooting top scores with new ammo (arsenal and commercial match stuff) could never get reloaded cases from them to shoot accurate in their M1 and M14 platforms. Same thing for AR platforms. Those fired cases had their heads press way out of square and resizing them did not square them back up. So, unless your AR's bolt face gets squared up properly, new cases will probably produce best accuracy. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Reloading for Gas Guns?
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