I am new to reloading and am currently reading all info I can find concering necksizing .308. I've found a tool to check neck runout... but what is acceptable?
I've experienced quite a bit of resistance when withdrawing expander ball back through case after neck sizing. I've measued neck tension after seating bullet to be ~ .002. I am wondering if expander might be a bit too large or possibly too rough on inside of neck causing shoulder distortion of my once fired brass. Or perhaps too much resistance when seating bullets due to roughness of inside of neck. 80-90% of rounds chamber but rest chamber hard and are difficulut to extract. These bullets exhibit scoring just forward of case neck. What is best way to proceed.... pull the bullets remove expander ball from die and FL resize to correct? Polish expander ball, lube inside neck? Any advice would be appreciated.