All the guns I shoot regularly are have Damascus or twist barrels. My Lefever "H" (1898 Mfg) has over 11000 rounds through it, of my shooting. Couple years ago it broke a hammer, fixed by Mr. Buck Hamlin, and is back in service. The reason Amarillo Mike shoots Black powder in his 16's is so that no one can see how many birds he misses for the smoke...