Bullets tumble upon exit from barrel.

[CINDERS]

Do the poor mans muzzle gauge get a loaded round stand the rifle on its butt with the bolt open preferably removed then put the pointy end of the projectile into the muzzle and see how far it enters the bore if it leaves about 1/8" - 3/16" of bullet showing before touching the brass neck then the muzzle is not to bad.
You would then look to see if it has cord wear from the pull thru cord wearing out one side of the muzzle causing the gas to vent first from that side before the bullet has exited the barrel.

If the projectile drops right in and the barrel crown is touching the case neck your done and dusted new NOS barrel, lothar walther or criterion barrel time, the rifle may also have excessive throat wear and if the projectile starts in the bore crooked it aint coming out straight either which ever way you look at it tumbling projectiles at 50 yards I'd say your barrel is stooofed...

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[GeeRam]

which ever way you look at it tumbling projectiles at 50 yards I'd say your barrel is stooofed...

Does seem the more likely scenario in the circumstances.....given using PPU ammo, which is the best available commercial ammo, other than finding some genuine milsurp Mk.VII which is not easy......and the fact that it was a $400 rifle, which in this day and age, is somewhat cheap for a No.4?