As indicated by accuracy testing, the steel cased/bimetal jacketed ammunition caused accelerated wear to the inside of their respective bores. While the barrel of the Federal carbine had plenty of life left, even after 10,000 rounds at extremely high rates of fire, the Wolf and Brown Bear barrels were subjected to the same rates of fire and were completely “shot out” by 6,000 rounds.
At the end of the test, the chrome lining of the Wolf and Brown Bear barrels was almost gone from the throat forward, and the barrels had effectively become smoothbores, with the rifling near the muzzles acting only as a mild suggestion on the projectiles. A throat erosion gauge could be dropped into the bore from the muzzle end with absolutely no resistance.
The difference in price between brass and steel cased (more specifically, copper jacketed and bimetal jacketed) ammunition means that you’ll have plenty of savings with which to buy new barrels – even if you shoot so fast that you replace them every 4,000 rounds. For this chart, brass ammunition was calculated at $130 per thousand higher than steel and replacement barrels at $250 apiece.
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