Got this mold for my 300 AAC blackout AR15 . Just for grins I worked up a load last night , and just decided to see if the bullet would at least chamber. That would be a noooo, lol. What are you guys sizing these bullets down to . I do have a thin coat of epoxy on the bullets , but I'm guessing this bullet needs to go through a 309 sizing die?
This is a 150 gr 30 cal.