Im no expert in this but sounds like you are looking in the wrong area for a problem. 0.1 of a grain is 0.04% difference in weight. 1 grain is 0.4% difference compared to the 250gr rated pill, even less compared to a 285. Sure it will have some effect but its probably not worth thinking about. 1 grain spread in a 55gr .223 pill is almost 2%.
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