Mauser/Primer Problem


May 17, 2006, 06:59 PM
Ive got a 1909 argentine mauser in 30-06. I am shooting some IMI manufactered ammo that when i shoot the primers push out of the case. Ive not shot any other ammo out of it yet but i still dont think its the ammo that is the problem. I am thinking this is a rifle problem but am uncertain what the problem is. any clues or answers would be greatly appreciated.

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May 17, 2006, 07:09 PM
headspacing comes to mind.
consider the rifle unsafe to shoot until you get it looked at by a gunsmith.

are the cases doing anything else weird? around the mouth and shoulder?

it might be ammo that is just loaded too hot.

have you taken the bolt apart to see if anything is broken?

might be that the firing pin is overpenetrating?

i'm no expert, but this is the right place to find some.

May 17, 2006, 08:31 PM
all of the cases fired did have fresh but even and consistant marks around the shoulder and on all of the cases. all of the marks are made when firing as the unfired round i put into the chamber and then removed with out shooting had no markings.

as far as bolt being broken, i do not think it is. all functions performed flawlesly.

now the firing pin hitting the primer could be a problem. it isnt punching a hole in the primer but leaves a heck of a dimple!

May 17, 2006, 08:39 PM
Look for incipient case head separation and excess primer flow into the pocket or actual burst primers. Sometimes primers backing out isn't a problem. A lot of old leverguns seem to do it, even with fine headspace. But Mausers are another matter. If you have an Argie in '06, then you have somebody's custom job and it's entirely possible they didn't get the headspace quite right. I'd check it for sure before doing any more shooting.

May 17, 2006, 09:07 PM
cosmo, im thinkin the barrel has not been replaced. it has the original military sights, step in the barrel, matching serial number with the reciever, bolt, and floor plate, and it even has wear marks where the military stock used to be on it. now then, on the barrel in front of the step on the left side it is stamped 7.65 which appears to be an original manufacturing stamp. but also right in front of the reciever on the barrel it is stamped 30-06 which im assuming is an importer stamp. so now im wondering, is a 7.65 the same as a 30-06?

Jim Watson
May 17, 2006, 09:16 PM
The Argentine service round in the Mauser days was 7.65x53.5, same as the Belgian and early Turkish Mausers.

A .30-06 reamer should clean up the chamber but if hastily done, it might have been run in too deep and give excess chamber headspace.

But that is a cheapo ripoff conversion even if done right and not in a sweatshop. The 7.65 has a .311" - .312" groove diameter and shoots bullets like .303 British and 7.7 Jap; .308" bullets from .30-06 are not going to give real fine accuracy.

May 17, 2006, 09:24 PM
thanks mr. watson. as soon as i can get some headspace guages and inspect the chamber ill check it out.

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