300 blackout: Gas Check vs. Plain Base, Powder coating extra speed?

[wacki]

When casting molds what grain size / speed need a gas check? Does powder coating allow you to push the bullets harder while keeping plain base? What about smooth vs lube grooves?

[Smoke4320]

wacky
I have been able to get to 1900 FPS accurately with PC'ed gas check bullets WITHOUT checks. .recovered bullets showed full coating no burn off at all

A plain base should be even better .. Just don't have plain base mold to try it..

Tried a Smooth sided 30 cal 230 gr bullet in the blackout got no leading at up to 1200 FPS accurately and 1600 FPS in a 308 accurately


trying to get one of the HP mold Mfgers to make a 150 Grn smooth sided HP mold ..Much like the Mil hec 312-159 just smooth sided
I think this combo would make a very accurate bullet

[wacki]

Tried a Smooth sided 30 cal 230 gr bullet in the blackout got no leading at up to 1200 FPS accurately and 1600 FPS in a 308 accurately

Powder coated or not? Gas check? Plain base?

[Smoke4320]

PC'ed Plain base 230 grn RN