The numbers from that test look kind of fishy to me. I guess I don't see how the same powder charge produces 1944 fps with a Barnes 250 grainer, and yet only 1546 fps with a 245 grain Powerbelt. I can see some variation because of bullet design, but a 400 fps difference with the same grain bullet? Just sounds fishy to me.....
Gelatin tests are helpful in some ways, but it's not the same thing as shooting a live animal. Some people claim Powerbelts blow up at high velocities, which I can believe if you are pushing them hard. But then I've seen other gelatin tests that show that the heavier Powerbelts at slow-to-moderate velocities out-penetrate quite a few other bullets. I think it is all about knowing the bullet you are using, its limitations, and what is the proper load. I've never used Powerbelts on game, but if I was not allowed to use sabots, I would be shooting the 275 grain Powerbelt out of my .45 with 70 or 80 grains of powder....