I am casting SWC for .38 spcl and am using a Lee mold for 158 gr. After sized and lubed with Alox, I weighed 100 individually on my digital scale (compared to my balance scale) and have them separated by 1/10th grain. For best accuracy, what is the most practical weight increment to group them into? For example; put all that weigh between 159.0 and 159.9 into one group and 160.0 to 160.9 in another, etc. or closer groups or does it really matter at all?
Also, since they all weigh between 159.0 gr and 161.5 gr, should I vary my powder load to be less or more for the higher bullet weights compared to the lighter bullet weights for best accuracy?
Thanks
John