Or should this say whats the most common reamer for .308win? For tatical rigs fed from mags to single loading for F-class what Reamer would you use if you could only cut with one for the rest of your life. Like on the GA Precision gallery, the pic of the .38/.29 inch group shot out of a barrel with 5000 rounds. And How does one go about cutting to minimum SAAMI specs to make factory ammo accurate and still have a "must feed and extract to save my life" head space?