Looks like it should be a good rifle for RB loads. The 250 gr REAL might shoot from a 1:66? I was suprised how well they shoot from my 1:28 GM LRH barrel. I thought as short as they are they would be best from a slower twist.They seem to be a very versatile bullet, as they also shoot great from my 1:48 NewEnglander. I'd like to hear how they do if you try them.