Nice blueprint,though I'd change a coupla things,assuming you reload? Hint.
I'd stay Rem Sporter and simply recontour to same and stop at 22". I'd want 8" RPM and just (1) barrel and that in Vanilla 280. I'd simply let the best bullets going,do the work and not fret a fhuqking thing,with a throat kissing a 180 ELD M at 3.585" COAL and plenty of room to chase lands. Hint.
As to the bottom,I'd RHR and never look back. Have more than a few and they are Skookum. They are in stock(I checked). Hint.
With a 1" Decelerator,in that excellent stock pattern,recoil will be minimal,with performance off the fhuqking charts. Hint...............