Just picked up a Sendero 300 RUM with 200 rounds thru it, throat & barrel checked out good. Gun has muzzle brake on it, glass bedded, 2.5lb trigger, Burris 8-40x scope, everything tight. Shot factory 180 Remington Core Lokt at 100yds, 5/8" 3-shot group from a bipod. Loaded some 212gr ELD-X with Retumbo and US-869 at 3000 fps, loaded 3.900" OAL, Bowler brass, expecting results. Floored that it will shoot no better than 2.80" 3-shot from a bench @ 100yds. I shoot several other rifles well under 3/8" @ 100yds, and these were not fliers, barrel was cool. Ideas?
Wondered if the 212gr is too heavy for the 1:10 twist perhaps? Haven't had opportunity to shoot the factory 180's again but that's first thing I'll do next time out.
