In the cast bullet business i get alot of questions on what works and at what price, and this is going to ruffle a few feathers, but a lifetime of casting and shooting cast bullets shows some trends, and this has to do with production(machine) cast bullet designs......Production casting machines require moulds that have very simple bullet designs, without sharp edges, fewest lube grooves possible, rounded corners, rounded lube grooves, bevel bases.....all these factors combine to allow the bullet to "drop" from moulds quickly without interruption to the machine(halting/slowing production)......These same factors combine to produce the LEAST effective bullets for the shooter!!!! Good cast bullets should have sharp edges, fore and aft., for max. shock(meplat) and for best gas seal of bullet base, bevel bases tend to direct gas along side of bullet. Bullets that have the most grooves tend to be the most accurate, combine this with deep square lube grooves and you have much more lube going for you. Production machines function best with only 1 alloy, which can be either too hard or too soft for your application, witness machine cast BPCR Slugs avail.(and at a good price) that are cast with Lyman #2 alloy(hard) and 1 lube groove....def. not what you want for BPCR bullets.......this was more of a primer for new users of cast bullets, and I will gladly answer(if I can) any questions re: casting/testing of bullets for the reloader.