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fallacy in the test as its one barrel type, also conditions are suspect.
its doesn't double barrel wear twice as fast on ALL barrels.
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5k of brass vs steel you would maybe save $350-$400... So it's almost a wash for a new barrel every 5k.
fallacy in the test as its one barrel type, also conditions are suspect.
its doesn't double barrel wear twice as fast on ALL barrels.
One large issue with that test was that it did not separate the effects of powder and bullets. The Tula used in the Lucky Gunner tests was very obviously hard on the throat and crown of that gun, but did the barrel wear because of the bimetal bullet? No way to tell. Barnaul's ammo uses bimetal bullets as well, AND caused more throat erosion in the Lucky Gunner tests... Was it the powder, the bullets, or both combined?
A SOFT steel jacket can't damage a hard steel barrel. Theoretically, the bimetal jacket should be made with steel that is as soft as the gilding metal (95% copper, 5% zinc) used in US bullet jackets, which is how steel-jacketed M80 7.62 NATO bullets are made. Even with poor compliance with this ideal, it would be expensive and difficult to make those jackets hard enough to wear on barrel steel. BUT, if you add in powder that is shown to erode barrel throats quickly (suggesting higher flame temperatures and other factors), the steel jackets could accentuate the powder's effects.
The ONLY way to say that bimetal bullets do anything specific, you MUST do extensive testing with those bullets in carefully loaded rounds using a variety of quality powders (including both single- and double-based powders). That's a lot of work to find out whether there's a small likelihood of a particular bullet construction causing a specific type of wear.