If you have an interest, try casting a batch of at least 100

by John K., Monday, March 25, 2013, 14:32 (4206 days ago) @ Dave B

weighing each to the nearest tenth of a grain and creating a "bell" curve. That will tell you your standard deviation and where plus or minus three SDs are located - that will tell you the range of 99.7% of bullets cast will weigh (using that process).

You can even stack them on vertical lines by weight for a visual... here's one from 2005 when I was working with the Lyman 520gr 457125 bullet. Finally settled on the 457132 Postel bullet for my Shiloh Sharps; for some reason I can hold weight tolerance better with the same casting process - plus or minus 1/2gr on a 535gr bullet.

I had MUCH rather develop a reliable casting process than to try and sort in quality.