This is a general topic, not specifically related to bolts or semi's, nor reloading, but I'm gonna put it here...
Did anyone else catch the latest episode of Guns 'n Ammo?
They interviewed an instructor from some branch of Special Ops, that said in the last couple years they've come to the opinion that copper removal initially hurts accuracy- and that it takes a few dozen rounds to get it back to where it "was"...
Reasoning was that minor imperfections in the bore, are filled by the copper sloughing off the bullets, and by keeping these filled, accuracy is optimized.
Now, copper isn't removed until accuracy drops off. His example was of an AR-10 platform rifle, which he said had some 7,000 rounds on it (wow...) and that it still shot sub- half minute groups, and would not have the copper removed until groups opened up to over one minute.
Now, the reasoning makes sense to me...and while I notice that it takes a few more than the initial "fouling" shot to get me tight, it's not dozens...I use Wipe-Out exclusively, so copper is removed with each cleaning.
I've never noticed an improvement in groups after a few dozen rounds...
I know this topic has been discussed ad-nauseum here and elsewhere, but this "official" endorsement of leaving copper in the barrel is making me have second thoughts on copper removal.
If you're current or recent former military, I'd also be interested in hearing if this is now current practice everywhere, or just sniper/ DM training...
Also found it interesting that the instructor said they remove the cleaning jag before running the rod back through the barrel and out of the action. Anyone else do this? I never figured a brass jag could hurt the rifling on the way out...
Did anyone else catch the latest episode of Guns 'n Ammo?
They interviewed an instructor from some branch of Special Ops, that said in the last couple years they've come to the opinion that copper removal initially hurts accuracy- and that it takes a few dozen rounds to get it back to where it "was"...
Reasoning was that minor imperfections in the bore, are filled by the copper sloughing off the bullets, and by keeping these filled, accuracy is optimized.
Now, copper isn't removed until accuracy drops off. His example was of an AR-10 platform rifle, which he said had some 7,000 rounds on it (wow...) and that it still shot sub- half minute groups, and would not have the copper removed until groups opened up to over one minute.
Now, the reasoning makes sense to me...and while I notice that it takes a few more than the initial "fouling" shot to get me tight, it's not dozens...I use Wipe-Out exclusively, so copper is removed with each cleaning.
I've never noticed an improvement in groups after a few dozen rounds...
I know this topic has been discussed ad-nauseum here and elsewhere, but this "official" endorsement of leaving copper in the barrel is making me have second thoughts on copper removal.
If you're current or recent former military, I'd also be interested in hearing if this is now current practice everywhere, or just sniper/ DM training...
Also found it interesting that the instructor said they remove the cleaning jag before running the rod back through the barrel and out of the action. Anyone else do this? I never figured a brass jag could hurt the rifling on the way out...