One measure of how accurate your ammunition may be is weighing it. I had about 30 rounds of 115 gr. FMJ 9mm Parabellum, mostly PMC. The closer they are in weight, the more likely they are to have the same ballistics. Sure, some may have more powder and a lighter bullet, and therefore a little hotter, but as a first approximation (especially if you do not handload), it is a start. Of about 23 rounds, all but one were within 0.1 grams of each other. Many were exactly 18.08 g, or 18.20 g. (These may be of different boxes; this is a scattering of 9mm rounds in the bottom of my range bag.) That Assuming all the 18.06-18.14 g rounds were from the same lot is impressive. (The outlier was 1.53 g.) I may try this again with a single box.
if the cases are different, or of a different batch, you will find that the weights vary widely.
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