The ole' .270 WSM with, 140 gr AccuBonds or, Berger Classic Hunter, Bullets at, 3,150 to 3,200 FPS, do a pretty good "Job" on Elk,.. I have "some" personal knowledge on, this subject.
A Factory, Tikka T-3 Rifle with, MINOR work ( adjust Trigger, good recoil Pad & careful Barrel "break in" ), shoots, either of, those two .270 WSM bullets, pretty, "well" !
Tell your Buddy to, SAVE some Money on the "Custom idea", cause, to 6-700 Yards ( or more ) it'll do, fine !
So, put that extra money into, a "good" Scope and, a Tag !
Yup, the 1-8 Twist, 26" bbl. with, the 170's will get him some more, Range but, at the expense of, LESS Barrel Life and MORE, recoil ! Remember that, you HAVE to "work up" loads and Practice,.. some !
I'm NOT a Brake fan, on Big Game, Hunting Rifles ( personal Opinion ) cause IF you EVER forget to, put Muff / Plugs on, you'll suffer a Lifetime of, Tinnitus ! PS; a Chit ton of, Elk are shot at, 300 Yards or, less !
Build, a 7.5 pound Rifle and get ready to, do some serious, "Huntin' " cause, you'll need to be, "in shape" for, Elk.
It's the Indian NOT, the Arrow that, gets most of, the Elk.