I'm using Lapua brass Fed GM210M primers two powders that I really like in my 20-250 with the 55 Berger, to Varget and H4350 my Varget load is 33gr with the 55gr Berger for around 3750 fps and for the H4350 36gr, I went up to 37.5gr for 3900fps but THIS LOAD WAS HOT very hard bolt lift.
The usual caution these loads where safe in my gun please use caution I worked up to them 2/10th's of a grain at a time