I think Powerbelts can be great when used properly. As it's been said, you have to really watch how fast you push them. For most of the PB line, 80 grains of powder is about max (unless you're shooting a heavier grain Platinum).

My cousin over Christmas told me how he had shot a doe during gun season with a 245 grain PB and 150 grains of Pyrodex at a distance of 20 yards. He said the entrance hole was the size of a football and the bullet had literally expoded inside the ribcage. No pass-thru of course, but it did destroy the heart and drop the deer instantly. I guess he was happy with it - I sure wouldn't be.... what if you had an angled shot or had to shoot through bone??? You'd have a wounded deer that will never be recovered and die slowly.