Let me start out with the background. 243 AI, Pacnor super match blued fluted barrel, accurized ruger mod 77 mark II action, bedded in a thumbhole laminate stock. Barrel broken in while fireforming 100 rounds of mid load 4831 and a host of leftover bullets. fireforming was definately sub moa using virgin lapua brass. Ladder test with IMR 4350 starting at listed max (41.5) for 243 win in nosler book pushing 95 gr ballistic tips. 20 rounds loaded in .2 gr increments and seated 20 thousands off the lands. I had access to a chrony but it went away when my buddy shot it and its not back in business yet. 5 foulers fired from a clean cold barrel and zero set for 300 yds. All remaining shots fired about 3 min apart and 10 min cooldown time between every 5 shots. Barrel never hot to touch. Next 6 shots marched right up the paper from dead zero to about 3 inches high and 2 inches right. shots 7 through 19 were all within a 3"x3" block that was very difficult to mark towards the end. There was no deffinate stringing or grouping other than within moa. shot 18 had sticky bolt lift and 19 left extractor mark so I stopped and did not fire # 20 which was loaded with 45.3 gr powder. I could not get a definate node so I took shots 7 through 17 and figured about 3/4 way would be #14. loaded up 50 of those babys cause I'm going hunting this week and zeroed for 100 yds. 100 yd target revealed .25" 3 shot groups when I'm doin it right so I guess I'm in business for now. I'll let you know how I do. Anyone got a suggestion or comment on how I should have done this test other than use a chrony as confirmation for the load I picked?