Most factory 38 special 148 HBWC ammo runs 700 to 800fps . Good advise not to exceed 800 . Swaged will give best accuracy within the above velocity envelope . Stay away from plated as accuracy will suck & you have to bump powder charges so you won't stick one in the barrel . I watched a fella blow the extractor out of a 52-2 with 3.5 Bullseye & Berrys plated HBWC . Gun was designed to shoot mid range HBWC loads in the 8 - 10,000 psi range . Exceeding that limit will stress & batter / wear gun . Can offset this to a degree by changing main & recoil springs , but why take a chance . Parts are expensive & getting harder to find .