The 26" in .357 cal is great, although you could go slower for short, light slugs.... A slower twist would be better in .457 cal, about 32" for a 400 gr., slower for the shorter, lighter stuff.... At the time I designed the .30 and .357 cal airgun barrels, a 26" twist was the slowest mandrel that TJ's could have made.... Bob
NSA 142gr perfect match for TJ 1:26Mike Dowling on Feb 13, 2021These are some of my favorite slugs. I shoot them just over 1000fps at the muzzle out of a re-barreled custom Bulldog. They are very accurate when combined with the TJ 1:26 barrels and higher velocities.