I have a plain jane .338 RUM XCR. Its in the same boat. Under 10lbs with a MArk 4 4.5-14 and bi-pod. I havent shot much past 1000 yards but inside that its awesome (well once at almost 1100). I really think that remington dropped the ball with this on when they let it fall out of production. Ive only seen a few of them, but nobody lets them go... wonder why
92 grains Retumbo 300 grain SMK- won't mention how small, but never ever over .75 MOA. Good enough for a light wieght I'd say.