Probably the best thing you could do is one of the adjustable moa rails too add as much elevation. Any decent bolt should be good at really long range. I was playing with my antique 146ba with a vortex HST and with max elevation on turret and bottom hash mark I was still about 18" low at 340 yes yesterday, but hitting a 12" gong quite easily. I have a 20 moa rail on my savage tr but the Chinese Mueller scope has very little moa of internal adjustment. I also find cci AR tactical ammo good at long range.