WOW ag42b ljungman

Those marks look like someone had a broken case stuck in the chamber.....they may have screwed something in to pull the broken case out and damaged the chamber....That could cause your extraction problems....Or it could be the ammo...or damaged extractor....
Russ...
 
Does anyone here know how these marks got in the chamber?
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I swear I saw this imprint on a piece of brass right here in this forum!!!!

Did this brass picture not also have two (2!) expansion rings visible?

Can you post a picture of one of your fired cases?
 
Yup, those were my pics from a little while ago, still trying to figure this out. The rings are actually just discoloration, they are present on the unfired surplus ammo too.
AG42bcasesmarks.jpg

Oh yeah, check out the dammage to the case head, no reloads for this brass!
 
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Mitchell said:
On my ljungman there is a little screw at where the gas enters the gs system that needs an alan wrench to remove it. does that act as a valve? screwed in more less gas and unsrewed more more gas?
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Could be that someone drilled and tapped an adjustable gas screw in the past. I read some examples of such a procedure on Gunboards, mine has the same modification and it works pretty good.
 
It's not mine, the pic came from Valley online auctions, I've tried to find out the make of the mount but to no avail. Someone told me it could be a B-square mount but I've been to their site and couldn't find anything that resembled it.
The mystery continues....
Here's another look,
AG42bScoped2.jpg
 
Swiend - don't know how deep the gouges are, but there would be no harm done by doing a little polishing, to at least make sure there are no prominent burrs projecting into the chamber. AG42Bs have a non adjustable gas system, and port pressure is critical. Too high, and the breech will try to open before residual pressure has dropped enough to allow the case to release form the chamber. A torn rim results. The case isn't stuck, it just could not extract at the time. If port pressure is a bit high, the case gets yanked out, and the rim is bent. Because bolt velocity is high, ejection can be dramatic. The little spare parts kit had extra extractor parts for a reason. AGs usually are very accurate. They are also a quirky design. I have seen a few that would not function with the brown box practice ammunition sold surplus, unless the cases were lubed. The lube allows the case to extract while residual pressure is higher than it should be, but does nothing for high bolt velocity. These rifles were never universal issue, and were surplused even before the 1896 Mauser rifles.
 
Yours is discolouration, but I've seen "expansion rings" like that before in a Swede Mauser when the brass used was undersized at the base (0.470" vs. 0.479") and rim (0.473" vs. 0.480"). It is common for manufacturers to simply use 30/06 base and rim dimensions (and equipment) for their stock of 6.5x55, as they are "close enough". It "works", seems to extract fine, but leaves the rings. IMO (and experience), brass undersized 0.015" or less at the base poses no danger - this sort of situation is very common with Guncranks who need to make up brass for obsolete chamberings. When the difference gets into the 0.015" range you are looking at building up the base diameter with a brass ring, as much to keep the round centred (at least for the first firing) as to support the base.

Swiend said:
Yup, those were my pics from a little while ago, still trying to figure this out. The rings are actually just discoloration, they are present on the unfired surplus ammo too.
AG42bcasesmarks.jpg

Oh yeah, check out the dammage to the case head, no reloads for this brass!
Click to expand...
 
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Thanks tiriac & Andy, this ammo is indeed the brown box surplus, it really didn't work well in my AG, I even got a nasty "stovepipe" where an unfired cartrige was damaged as it was jammed up against a stuck case and the bolt. Not fun. I do reload, I'll try H4895 since it will work well in my other milsurp calibres.
 
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