Well I got some loads worked up for my 300 RUM today. 220 ELDX with 89 grains of Retumbo. To be perfectly honest this was the first time I have ever shot a 300 RUM and did not know what to expect. The Ross Schuler brake tamed this rifle to a pussy cat. Recoil was nothing. I can now say the Ross Schuler brake is very effective in reducing recoil.