BACKWOODS83, I have a rifle that I purchased for the sole purpose of shooting 168 Bergers. I tried 22, 7828, and finally settled on H1000. My gun is tight chambered apparently, and I am getting 2977 fps,using 67.5 grains.
I am using a " standard" WLR primer. The gun likes these primers more than the mag primers. H1000 is supposed to be a Extreme powder. I believe that to be factual due to the fact that I developed the load in 50 degree weather, and I shot a whitetail in July on a crop damage hunt in 94 degree heat. No pressure signs, no change in impact. Two kills, one at 366 yards, and one at 209. My load is a little on the mild side, but it is incredibly accurate and predictable. Hopes this helps. AIM SMALL, MISS SMALL