Get over the bolt action fascination that therein find success. High Walls, Ruger #1, NEF, Marlin CB or -kaff- Guide Guns, etc. etc. Big hammer, lots of range if you figure out where to point it.
If you just have to have a bolt action the 77/44 works well with 300 grain bullets. RN paper patch gives a BC of about .240, MV of ~1600 fps. +9" at 100 yards, zero at 200 with remaining velocity about 1160 fps.
