I'm sure matchgrade barrels get far better and more frequent cleanings than the milsurp rifle barrels I've cleaned up over the years.
I've cleaned up bores with grooves packed solid with fouling hardened by decades of storage without ever having been properly cleaned. When finally broken loose it comes out in palm fulls.
Any grit introduced into propelents can be a factor in wear.
The older ground glass added to sensitise primers for example, before barium salts were substituted.
Some milsurp ammo I've broken down for components had globs of sealant that intruded into the powder space, properly assembled ammo should have no more than a smidgeon near the case mouth.
I've made scrapers from brass tubing to clear out fouling from the chamber neck that was thick enough to cause excessive pressures when a cartridge was fired.
The hardened fouling looked like scrappings from an old phonograph record, coming out in thin coils. A dry crusty deposit under that looked more like graphite and came out in dusty granules.
Never saw anything like it on any commercial firearms no matter how abused.
With an SKS I cleaned up a couple of years back the fouling dissolved in the solvent into a laquerlike mess that took forever to get out.
The bore looked like a patch soaked in stock finish had been run through it till it was all gone. That had to have come from the asphaltum sealant and laquer case coating of Soviet ammo.
If every type of milspec ammo was as well put together as US government ammo there'd be little to worry about on these scores.
Some NATO interchangeable ball is atrocious.
|