For hunting I shoot 3 round groups with cold bore and clean barrel, but for match ammo I test with 5 shot groups with a hot barrel. I shoot several sighters off a clean barrel until it starts grouping good, then move on to testing the different charge weights shooting the round robin method. In the picture below my 43.3 group had the best 3 shot group I ever had, it measured around .018 but then the 4th and 5th shots to that group opened it up to a little over 1 ''. The 43.7 load is the one I was looking for a match when your shooting 20 shots at a time in less than 30 min. The 43.7 group is a little over half moa which is good enough for short range F/TR. I fired these 19 shots in 12 minutes.

10fp .308 varmint barrel
Varget powder





Hunting load work up with Nosler Ballistic tips.