I use Varget for my 168gr Hornady bthp it should be a fairly similar load for the Bergers but I'd start around 42gr and work up. I use federal large rifle primers and 43gr of varget.
it will shoot a Five shot group as one Ragged hole at 200 yards all day. I had plans to try to 178 grain bullet but was so impressed with 168 grain bullet that I didn't even bother.
the rifle im shooting is a Remington SPS varmint with a 26 inch tube 1:12 twist.