I am kind of headed this direction by returning to "standard" cartridges but utilizing more recent bullet opportunities by going with faster twists, longer barrels, longer throats. Put together a 1:8tw .270 on 700LA that surprised the crap out of me in performance after reading
@FEENIX .270AI. Not an AI but still way better than std .270. On my way to 06 in same path. Why? Just like OP stated, components easier to find for std cartridges. Heck, a 1:7 .270 may be next after the 06. The .270 fast twist will stay pretty close with the 6.8 Western so why not? Plenty of brass around, can use LR or LRM primers, however, holy grail powder is the RL26 pixie dust which is rarer than politician integrity.