Shooting 150 grain Combined Technology bullets in front of 102 grains of ADI2217 (H1000 in the US). My 300 RUM has far less recoil than my 270win. Admittedly the 270 is a lighter rifle but the 300rum Remington Sendero could not be called heavy. Shooting at 100m, I blink and don't open my eyes quick enough to see the shot but at 500m shooting at metallic rams at the range I see the bullet hit no worries at all. I fired less than 50 rounds before I had the brake fitted and was loading far less than what I am loading now. Before I had the brake fitted, I would flex against the rifle, bracing myself for the recoil, now I just hold the rifle firm and squeeze. I think fitting the brake has increased my accuracy in the shooters ability if not the rifles.