I was lucky???? My M7 fed like glass from factory parts that came w/260 set up, save for a M700 stamped nickel/chrome looking follower, that is hollowed out on the underside.
Of course mine was a BR and those short things are just about right when a 120-140 or so grain is loaded up. Later a Stiller action in 6BR also fed fine using stock 700 mag parts.
The BR is hard to overlook when you have one in hand and spend some time shooting it. They are very 'user friendly' and have punch to 400 yds on deer, at least the deer I dropped a few years ago thought so via a 105 amax in 6BR
Nothing against a 7TCU, IMO, a 200 yd solid killer on deer in a handgun, 250 or w/a rifle bbl.