I'mk sure that my views on the 'shot-out-bore' syndrome are well known. We had all manner of bore gauges, leed wear, muzzle wear and so on and on and on plus viewing standards - always a bit subjective in my opinion, but they were there none the less. And these criteria would very often condemn a barrel. But now, the acid test if the gauging or viewing criteria is in doubt is the RANGE test. If it is accurate and can hoid a group as laid down to the EMER standard, then that's good enough.
BUT, you have GOT to use the standard ISSUE spec ammo. No home loads or 'factory' spec ammo from dubious sources. Standard issue NATO ball if it's a Military rifle.
You try some well stored UKMilitary Mk7 ball Gyro and see how it performs.
I had a No4T with a bore that I couldn't even get a glimmer of a shine out of. Looked like someone had dropped their soup down but it shot perfectly.
As for those poor souls who think that the way to test for a shot out barrel/muzzle is to stick the nose of a round into the muzzle........ Words fail me!Information
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