I had the same issues for a year with my 300 saum but I did find a recipe that worked in my Rem model 7 300 rsaum. Here's what worked for me.
Powder: IMR 4350 @ 60gr.
Bullet: Sierra 165 BTHP Game King
*Here's the real important part the bullet needs to be .007 from the rifling. Seating the...