The 90 grain bergers are for a 1 in 7 or faster. Have you tested them in the 8 twist? I shoot them in my 22-250. Barrel is 30 inches and I am throated 100 thousands more. This gun is so fun and extremely accurate. I shoot it with hodgdons 4895 at 3000 fps. I could go a little faster but accuracy was fantastic and pressures were good. You will enjoy shooting the heavier bullets. My gun shoots around 2.5 to 3 inch groups at 800 plus yards. My wife shot a 4 point mule deer buck at just under 600 yards this last fall. Very impressive combo in my oppinion and I am glad I made the decision to try the heavy bullets in a 250.
I'm using 31 grains H4895 with federal match 215 primers. Producing 3005 fps.at the muzzle. I tried H1000 and 4831 with outstanding accuracy but about 150 fps less. I wanted to be at least to 3000 fps. Hope this helps. Might load slightly less like I did and work up to avoid any over pressures in your gun. Pressures are good in my rifle. Using a savage 12 action.
I have a lot of shot data on this rifle with different powders and velocity spreads. If your interested just pm me and I can get you what I have for data since there was nothing to go by and I had to start from scratch. I ran 3 or 4 different powders and worked up and kept track of all the info.
I have not shot any coyotes yet work has had me very busy. I will let you guys know as soon as I get an opportunity to get out and shoot some votes. I'm hoping to get out next weekend but work may change my plans.