Phil, Just in case you run out of bismuth, you can shoot steel through open choked barrels with no damage. If you have less than .020" constriction there is enough compression in the steel loads to pass through the choke without stressing the barrels. That said,the bismuth or tungsten matrix loads are much more efficient and hard hitting. I have shot steel through and older VH choked .005" and .015" with no problem.That is also very close to the chokes on the repro steel shot specials.
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