I went down this rabbit hole about a decade ago. I started off with a few Savage MLII and various 45/70 conversions [Encore, H&R, CVA] and have done 3-4 heavier builds on R700s. I actually just sold a Hankins custom on the classifieds here last week. After all of that, I have settled on having two rigs for the variety of hunting I do. In a given year I'll hunt a number of whitetail states w/ stands, saddles, blinds that give shots from 50-150y to 600+ and some still hunting and drives thrown in as well. Having a lighter rig for tree stands, hiking and sub 350y shots and then a second for blinds and spots where longer shots are possible. I currently have a CVA Scout Hankins conversion [pic below] and a custom #6 Brux 26" - Mesa Prec. action, TriggerTech etc. Both are set up w/ Vortex Razor 3-15x42 HD LHT.
I'd suggest someone start off with one of the Hankins CVA conversions. I've had the SS and CM Scouts [also formerly, Hunter]. All 5+ that I have had or set up for friends, have shot extremely well. Doesn't seem to be a problem to get a 275gr bullet up to 2,500-2,600 fps and consistently subMOA w/ H or IMR 4198.
Pics of pretty typical groups and field results with these things.