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Unless you weighed the cases before charging with powder, finished weight variations could be from case weight variations. For some test load development, I will weigh trimmed once-fired cases to same weight range within 1 grain. Not sure how much weight variations in case weight affects target accuracy.
As to 45 cases, they will vary several grains depending on headstamp and lot. If powder charges were around 5-6 grains, it may be hard to detect whether the finished round weight variations were from case weight or powder charge.
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