I have one on 7mm rem mag.The 7,s have a teist rate that is 1/4 faster than senderos or 40 xb,s not alot of guys know this but its a fact you can go to rems web site and confirm. I have shot this gun exactly 116 times and its shoots a 162 amax @ 3150 with Imr7828 or a 180 Berger VLD right @ 3000F/sec. I have shot 1.5 groups @ 300 yards with both loads and I have shot a 4.5 inch group with it and the 180s @ 700 yards I may sell it for 650.00...this gun is mint and not a scratch on it!