Buy the Nikon and don't look back I'v got several Nikon Buckmaster scopes they can take a hit and some how hold zero but having said that I just ordered a Sightron SII Big Sky 6x24 for my 6br.
H 110 is a great powder I'v shot some 300 gr xpt out of mine and they are a handfull imr 4227 is also a very good powder with the 250 gr noslers and right now I'm getting ready try some titegroup with a 260 gr lead cast bullets.
Just going to play with my 6br a little more going to shoot some F class next year and hopefully having my 223 rebarreled with a 1/8 twist pac-nor maybe :wink: