Thread: bullet help please

I recall being told the issue was the .303 rounds where you found red plastic inside tip....some had alloy some cardboard...if you trimmed too far they could seperate and leave core behind.....like finwolf...not sure if its a real thing or a one in couple of thousand occurance...maybe in worn bore or very nickled up barrel.....I would shoot them off at range being cautious of any that didnt sound/ feel right....
and yes a quick twirl of the inside case mouth deburring tool qill remove crimp from primer pockets and allow the new primer to seat with ease...I presume these arent berdan primed...