If you dont have a overall case length gage cover a bullit with magic marker and just start it into a fired case, you need to put a slight ding in the case mouth to create some friction,easily slide it into the chamber with the bolt, once locked up open the bolt and remove the round paying attention not to slide the bullit in any further, if the bullit stays in the barrel stick a cleaning rod down the muzzel and push it out. Where the scratched portion meets the untouchedthis is max!, you dont want the bullit resting directly on the lands and grooves so deduct .005 and that is max for YOUR rifle. Now you need to make up two dummy rounds, this you will check function with, will they feed from the mag to the chamber and also eject!, if so you can start to reload, if not you need to make it a little shorter.This is one of the many ways to accurizeYOUR rifle, if you are wondering why I caped YOUR, it is because you need to keep those bullits with YOUR rifle, do not let anyone else shoot them in their rifles, their chamber could easily be shorter than yours and create unwanted problems not to mention law suits. As far as work-ups, Ive only used Berger in my .223, I used load work-ups from my Nosler book and just started a little low and worked my way up until I got good accuracy and consistant chronny readings.