It was quite foggy this morning. I could not see the target at 100 yards so I moved closer to 65 yards. Is it reasonable to expect that if group size was 0.3” at 65 yards then it would be 0.45” at 100 yards? I was shooting the Sierra 220 Matchking in a long throated 300 Win Mag. This bullet is touching lands at an overall cartridge length of 3.565”. I started load development with the bullet just touching lands. I am using Federal cases and Federal 215 Match primers. The rifle is a hunting rifle (8.3# without scope and sporter style stock) so I am not expecting 0.25” groups at 100 yards. I decided to test RL25 initially. Perhaps I will also try H1000. Groups were 3 shots and again they were at 65 yards due to fog. I started with 71 grains and got a 0.77” group. 72 grains gave 0.54” and 73 grains gave 0.31”. I think I can go up more in powder. Also I have not messed yet with seating depth. Are any of you using this combo of powder, bullet and case? If so where have you reached max charge and where do the bullets generally like to be seated in relation to the lands? What kind of velocity should I be able to get from a 26” barrel? Would H1000 be better? Thanks, Rufous.