Did you chrono them? How is accuracy?
I was doing something kinda/sorta similar yesterday: loaded and shot some 170 and 180 grain jacketed bullets in .357 with not much over starting charges of 4227. Still enough to come close to the base of the bullet, so max must be heavily compressed.
Average velocity was about 875 FPS. Considering that there is very little room for the powder charge to slop around, I was surprised that the chrono showed quite a large extreme spread. (Like, 100 FPS large!)
Despite that, I shot a couple of good (for me) groups in slow fire. Recoil and blast were mild for .357, but certainly more than a .38 target load, so wouldn't be great for rapid fire. I wanted to know if my revolver liked long bullets, and I guess the answer is "yes." Kinda pricey for plinking ammo, but I don't get to the range that often, so I feel I can't afford to shoot cheap ammo! It's a pity that I have a couple thousand cheap bullets that aren't really worth my time. Should have just bought 600 XTPs.
