In order to participate in the GunBroker Member forums, you must be logged in with your GunBroker.com account. Click the sign-in button at the top right of the forums page to get connected.
Possible headspace problem?
1fisher
Member Posts: 1,012 ✭✭
Hi folks-
I am looking at several old rifles on the auction side and have a question about a photo that a seller sent me. It is a 9x56 Mannlicher and the ammo and brass is part of the auction.
This is a box of shells loaded by Buffalo Arms in Idaho. I have bought loaded ammo from them in the past and found it to be very consistant over a chronograph, so I do think that they put out a good product.
In the photo, it looks to me like most (not all) of the primers have backed out on the fired rounds. So the question is - would you be wary of buying the rifle that fired them?
I am looking for an old rifle to do some target shooting and a little hunting, so it is not something that I would be shooting thousands of rounds from.
[img][/img]
I am looking at several old rifles on the auction side and have a question about a photo that a seller sent me. It is a 9x56 Mannlicher and the ammo and brass is part of the auction.
This is a box of shells loaded by Buffalo Arms in Idaho. I have bought loaded ammo from them in the past and found it to be very consistant over a chronograph, so I do think that they put out a good product.
In the photo, it looks to me like most (not all) of the primers have backed out on the fired rounds. So the question is - would you be wary of buying the rifle that fired them?
I am looking for an old rifle to do some target shooting and a little hunting, so it is not something that I would be shooting thousands of rounds from.
[img][/img]
Comments
The protruding primers is usually a sign of low pressure loads.
"There were protruding primers on some of the fired rounds. When the firing pin hits the primer, it pushes the primer and the new case forward in the chamber. When ignition occurs, the pressure expands the walls of the brass. The rough chamber, with its high friction, grabs the case at the forward position and the gas pressure first pushes the primer back against the bolt face. As the pressure builds, the brass case is stretched until the case head is pushed back against the bolt or the case supports the total load. If the case head is pushed against the bolt face, it would produce a flat primer, but flush. If the load is light, the case does not stretch so much and leaves a gap between the case head and the bolt face, but the primer is still against the bolt face. This produces the protruding primers."
Best.
I am just a little leery because of my good experiences with their product in the past. They seem to be pretty good at duplicating the original loads for old calibers.
What gun is this in exactly?? I have several OLD 8x50 and 8x56 MS's and they do Not protrude primers. As posted...the two piece bolt head affects the headspace and there was many of them changed over the years. bob
Yes, this is reformed brass. The more I think about it, that may be the source of the problem. I wish that I could reload one of those fired cases to see if fire-forming the brass would eliminate the issue.
This is from a model 1905 Mannlicher Schoenauer.
Without a headspace gage, you can't tell if either the ammo shoulder or chamber shoulder is in the right place.
LC brass HAD the primers crimped in, perhaps the pockets have been
"cleaned" up too much. bob
You could contact the ammo manufacturer, tell them the problem and ask what standard they set the shoulder to.