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I have a Win 1894 30-30 made 1901,the primer is backing out about 0,5 mm when i shoot it or when i fire only a primer in a emty case any idea what to do?
And as P O Ackley demonstrated ,a case grips the chamber tightly enough to be fired in an unlocked gun.
I get what your saying, but for some reason with these tapered rimmed cartridges when the headspace gets big the primers back out. IDK if its because off case shape, lower pressure or what but this is a common problem on Enfields. A quick check with a set of headspace gauges will quickly tell him.Can someone help me understand this issue? I'm trying, but I'm not there yet.
My understanding is that regardless of head space, the full load firing of a cartridge will drive the brass Back into the closed bolt face prior to expanding the cartridge body and "locking" the gas seal between the round and the chamber wall. If that sequence holds, It follows that "if all else is equal", the primer will remain "flattened" in the primer pocket flush with the cartridge base.
Sequence:
Hammer falls, pin is driven into the prime.
Primer is driven fully into pocket, and then ignites.
pressure builds, driving the primer out of the pocket somewhat, then driving the brass back onto the bolt face, re-seating the primer FLUSH with the cartridge base. Brass walls expand, (metal stretches) sealing the full power of the load.
pressure falls, brass relaxes, releasing it's seal in the chamber
extraction.
If that sequence holds, headspace should not effect the resulting primer position. But, excessive head space could result in a blown base.
Belted cartridges in other rounds are evidence of possible bad effects.
Wouldn't the cartridge need to bounce off the bolt face between the time the primer lights, and the pressure builds enough to secure the cartridge in the chamber in order for the primer to remain proud? Or, wouldn't the load charge need to be so reduced that the brass is NOT pushed back against the bolt face during ignition? . primer only, or "cowboy companion" loads?
Help where I've missed....
TIA
I have a Win 1894 30-30 made 1901,the primer is backing out about 0,5 mm when i shoot it or when i fire only a primer in a emty case any idea what to do?
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