Ok so I’m new to reloading and have a question regarding 762x39 dies. I’ve been searching and researching it seems the small base dies are better for the AR platform but as I was looking around the small base dies don’t seem to mention coming with an expander ball but the full length does mention a expander ball for 308/311 however my barrel bore size runs from 300-302 and the grooves are from 310-312 so which dies are best to purchase?