They load a 155gr hard cast SWC, at darn good velocities. The bullet is basically a shortened Hensley & Gibbs #68, looking a lot like it's 200 grain big brother. With this light a bullet, and a heavy charge of powder, there's a lot of gas pressure developed, which makes the compensators and muzzle brakes on the IPSC unlimiteds work just spiffy. These guns just plain don't flip in recoil, they come straight back. If you see one of these .45's in action, it will remind one of a German steam locomotive being strafed by a P-47 Thunderbolt, an explosion of smoke coming straight up out of the stack.
I've got a bunch of the 155's, and loaded them for my 3.5" Caspian Officer's ACP. Giddyup, but oh, my, the flash!
