i have 180gr jhp's from underwood and bvac. i pulled out my kitchen scale, which can measure in grams, and weighed each round. they each weigh 17 grams consistently. since each cartridge weighs 17 grams, is it safe to assume that the bvac will have the same power as the underwood? i'm guessing no, because there are other factors to consider, e.g. bullet type, powder quality, etc.