I'm planning on building a 300 Blackout "pistol" that will eventually be converted to a rifle once all the ATF stuff is finished up. It's either going to have a 7.5" or an 8.5" barrel, and I plan on using the LEE C312-155-2R for standard loads, and either the LEE C309-200-R or the LEE TL309-230-5R for subsonic loads. They will most likely be PCed.
My question is, is the gun going to have reliability issues with such a short barrel and cast boolits?