It is a 7mm rem mag. The night forcce is an nxs 3.5 - 15 x 50 with the moar. currently shooting 65 gr rl-22 with cci 250 primer and 160 gr speer btsp. had been running 63 gr imr 4831 with the same bullet and primer. the rifle only has about 300 rounds thru it. I don't want to grind off the dovetails and pua rail on it. My wife does the shipping at nightforce. the scope was gift last summer and the rifle she gave to me a number of yrs ago. When I had the leupold on it actually grouped quite well, 1" at a hundred. Was starting to think the barrel was fouled, cleaned the crap out of it. still scatters holes. am using a concrete bench with a lead sled. can't get any steadier. guess i shouldn't have broke up a winning pair.