Did you get that just on the first load or did you tune the load for your barrel? I usually break in a barrel with a series of loads for one or two of my preferred powders and load nine or ten rounds of each ‘load’ to get three good groups to measure for each ‘load’. Its a more effort, buts its also an excuse to shoot more. :)
So for a given bullet weight from a given lot (usually seated 10 or 15 mm back off of ogive), I might load and shoot ~45 rounds (3 groups of 3 each for a ladder of 5 loads from min to max load). I keep records for each gun so I know what works best for any given bullet type, and a given powder. Its interesting to see how the barrel harmonics can appear out of nowhere in a given ladder.
I only had time to test 3 powders with 3 rounds each.
H4350 was sub 1/2”
RL 15 right at an inch with what I believe was a flyer
100v was at close to 2 inch.
All same Hornaday brass and Accubond 140gr bullets
I remounted my optic and am sighting back in. Over next weekend I’ll be doing probably 7 rounds of each except for the 100v. Do t think my gun likes that powder as much.
Will go to my hunting property in 2 weeks where I can shoot at 200 and 300 yards. I’ll pre-load at home as I don’t have the equipment easily transportable. Honestly though I’m not a professional long range shooter. I hunt deer, hogs and coyotes on my properties. Never shot a deer at range longer that 200 yards.
I was really impressed with the 4350 performance this weekend though.