Armscor .357 125gr ammo is listed at 1875 fps and 984ft/lb.!...not sure of barrel length. Maybe those numbers are rated a little higher than reality, but having used them in the past I can attest to their power. They are HOT...hotter than any other .357 magnum round I have ever used or seen. I know about concerns with flame cutting and cone erosion, especially with 125 grain rounds. I also wonder about pressure concerns in the cylinder. I have a Ruger SP101, which is of course really tough. But will extensive use of these rounds bring it to an earlier demise? And are these rounds unacceptable for use in say, a Colt Python?