I just chronographed BB 158 (heavy) +P SWCHP-GC out of my actual carry gun (a 2" model 60 chief spl.) and the results were better than advertised. The average vel. was 1024 fps. which would relate to about 360 ft/lbs of energy from a 2" BARREL.. I also cronographed their standard pressure (NON +P) 158 gr. swchp out of the same gun and the average vel. was 866; again a bit higher than advertised; and better than what the FBI +P loadings (from Win. Rem & Fed) chronagraped! What impressed me even more was the consistency of the ammo. The difference between the high and the low shots were only 8 ft/sec which is unbelievable. The recoil from their +P was a bit heavier than the standard FBI loads from the big three, but nothing horrible. Just make sure you practice with the ammo you carry, so you know what to expect should you ever have to drop the hammer on a bad guy.