I am a huge fan of the old straight walled cartridges. I shoot them almost exclusively. I used to be a 45-70 addict, but these days I prefer the 38-55, maybe moving on to the 405 Winchester. Given all that, when it comes to long range accuracy, I go to 308 with 168 hpbtm. YMMV. There was a reason we went through the evolution of cartridges.