What has worked well for you with this combo? There isn't any shortage of data out there for it and I have a large selection of powder. Figured I might save a little work and ask the fire.

7828 is shooting great in my current 243 with 105s.

I've got plenty of 7828SSC that's a start.

H4350 is accurate but RL17 really is special in said combo.

May have to get some 17 I have plenty of 4350 and some MagPro that looks promising.

You should be able to find a good load with 4350, RL17, H1000, 7828, RL22, Retumbo, or RL26 somewhere between 2900 and 3100 fps, depending on which powder you end up using. I listed them in approximately lowest to highest mv in my experience.

46.2grs H1000 in mine with 105's

I went to 49gr rl26 in my 1:10 243. 47 shot best.

I am shooting 105 hybrids with 41 grains of H4350. Getting 3000 fps.There is room to go up a couple of grains if you need to, but mine just happened to shoot really good right there. 8 twist.

RL 26 and 105 gr max loads.