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I think the barrel has 1953 stamped on it, from memory.
Pretty sure the problem was the milsurp ammo
I’ve loaded up 2 different rounds to try, one at ADI’s start load, and one a little below that....

Loaded up 43 gr 2206h to try next range day. ( Sierra 150 gr )
Thats ADI’s start load.
We’ll see how that goes.
I pulled 5 rounds of the greek stuff, cleaned the cases and I’ll try
some 150 gr...

Bore was originally 7 x 57

The Sierras are flat base, so that should help
Gave the bore and chamber a good clean.
It’s a carbine, so short barrel.
I just don’t get why it got progressively worse ?

Edit the Greek stuff...

My son has a new toy, 1900 Spanish Mauser rebarrelled by their military to 7.62-51 in 1950.
Bore and crown look ok. So he bought some Greek surplus ammo for it and off we went to the range yesterday...