however,it has to be HELD at 38+degrees F, or it's not up to snuff. You have to have a chronograph, and calibrate the jello, with a 450 fps bb "rifle" hit, up in one corner of the block, and it must penetrate between 3-4" (or some such, never bothered to notice how much) or your results have NOTHING in common with the other data 'collected" in "properly-calibrated" jello.

You have to transport each block to the range in a cooler, shoot it right away, before it gets "hot", etc, HUGE pita, or the "test" result is meaningless.