8mm M48 extraction problems (maybe bad ammo)

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A2409611

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Does anyone else shoot the Russian capture 8mm marked "TECHRIM"? It comes in a white cubic box of 20 rounds, and is marked "8x57 IS". Opening the bolt is very hard using this ammo, compared to the Hornady match ammo that i've shot through the same rifle. The primers on this techrim 8mm are also very flattened upon inspection.

Has anyone else had this problem with an M48, or with this ammo?
 
Any ideas, what may be wrong with my rifle? I checked the headspace a day ago, and it closed on a go gauge, and didn't close on a no go. Just trying to figure out what is wrong
 
If that is the same stuff Canada Ammo recently had on sale, then I haven’t had any problems with it. Though I did encounter one that had a cracked casing prior to firing, though this round was dropped on a concrete floor.
 
The stuff is HOT.. I'm pulling the bullets and recharging the brass with 40 and 41 grains of the same powder.
Also you probably have a mismatched bolt with your gun
 
GUB said:
The stuff is HOT.. I'm pulling the bullets and recharging the brass with 40 and 41 grains of the same powder.
Also you probably have a mismatched bolt with your gun
Click to expand...

Yes. The bolt doesn't match, but the headspace is fine
 
I bought a bunch of that ammo a little while ago. Ended up selling it at a loss as I found it was way too hot for what I was looking for. Caused the bolt to be difficult to open on the 2 8mm Mauser rifles I tried it with (a Gewehr 98 and a Portuguese M1904/39). Both of those were all matching.
 
People will often blame the gun.... and it's usually a correct analysis given that it's the variable factor. No problems in other guns.
But, this time many have had issues with this stuff. Myself included.
I've concluded that the issue is the brass, and how it was prepped. Necks might have been annealed too much, and were not trimmed.
I have chronographed this stuff, and even reloaded the powder and projectiles in modern casings.
44 grains is what the original power charge should be for these 197.5 ss projectiles in a brass casing, for a velocity of 2500 fps.
To get 2500 fps, I've loaded 42 grains of this square powder in s&b casings with a cci 200 primer.
No issues when in the modern casings, and even 44 grain for 2600 fps was fine.
This stuff is not over pressure. Just the standard ww2 German loading.
Maybe a more generous chamber or a longer throat, is the reason others have not had the same problems many of have had.
One more thing, if 196 grain s&b runs fine in your gun (same weight of projectile and muzzle velocity) .... you can draw your own conclusion about this stuff.

A few more threads where this stuff has been discussed.
https://www.canadiangunnutz.com/forum/showthread.php/1684379-New-bulk-8mm-overpressure
https://www.canadiangunnutz.com/forum/showthread.php/1573878-Surplus-8mm-Mauser-Ammunition
 
A2409611 said:
Does anyone else shoot the Russian capture 8mm marked "TECHRIM"? It comes in a white cubic box of 20 rounds, and is marked "8x57 IS". Opening the bolt is very hard using this ammo, compared to the Hornady match ammo that i've shot through the same rifle. The primers on this techrim 8mm are also very flattened upon inspection.

Has anyone else had this problem with an M48, or with this ammo?
Click to expand...

Maybe the chamber needs a good polishing,could be a bit rough making the brass stick to it.
I like to use a chamber brush on a flex handle for all my rifles.
It does not sound that the ammo is too hot,I usually load 48 gr of 4895 or 4064 behind a 150gr bullet,no extraction problems and
gives good velocity in my WW2 K98.
 
I posted a thread awhile back about this stuff. My K98 hates it (Russian capture rifle in less than ideal condition), hard extraction, flattened primers and split cases. My M48 digests it fairly well.
 
A2409611 said:
Does anyone else shoot the Russian capture 8mm marked "TECHRIM"? It comes in a white cubic box of 20 rounds, and is marked "8x57 IS". Opening the bolt is very hard using this ammo, compared to the Hornady match ammo that i've shot through the same rifle. The primers on this techrim 8mm are also very flattened upon inspection.

Has anyone else had this problem with an M48, or with this ammo?
Click to expand...

Add me to the list, I bought 250rds of this ammo, put 5 rounds through and had a hard time extracting it as well out M1904/39. I didn't even bother shooting anymore, I think I'm going to try and return the rest.
 
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