The steel rods of the past used from the muzzle end did ruin a lot of the bores of military rifles. While the barrels are made of steel, the steel isn't that hard. I can just visualize a GI scrubbing away rifling and all...
Since the line through the barrel remains blocked at the breech of a M1 Garand by the heel of the receiver, even when disassembled, it's almost like the "Bore Snake" products were made for this rifle... You simply can't use a solid rod from the back of a Garand receiver. At least, not without some bend to it...
Another thing to be careful of is to not reverse a bristle brush (brass, stainless or other) while it's in the barrel or chamber. It needs to have enough clearance to be pushed all the way through, and then pulled back all the way through if you do that.
I like to start with the brush on a dry bore before using solvents. This way you don't build up a mud/goo version of the fouling before trying to use patches to clear it all out.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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