So I have a 16” pistol length gas 300. I am trying to run the lee 312-160 bullets PC. I have watched every video on YouTube and I have read every word on this fourm and for the life of me I can’t figure out what’s going on my rounds simply won’t chamber, i made a chamber cast and measured everything and I have between 3-4 thousands of clearance my throat is .311 and the throat on my 312-160 is 308, the neck is .337 and my loaded round is .335, my rifling starts .177 from the case mouth and my ogive starts at .176.... I have no ideas on what’s going on... do you? I can take pics if you need it. I am about ready to throw this thing out the window it will only cycle and feed M80 pulls FMJ
I looked up the Sami specks and measured everything and my chamber is good so that’s not the problem.