BooneCountry, I have had two 6/284's and a 25/284, great case. I had these rifles built in the early 80's for long range coyotes and then the 25 cal for p. dogs. At that time, I had no experience in reamer design in relationship with actions specifications and barrel life, experience obviously comes with a price. There were issues I encountered.
First was the length of the bullet to touch the lands in relation to how large the opening is in the action.
Second is the case's powder capacity vs seating the bullet way down in the case to conserve mag box length.
Third, the guns liked the bullets seated near the lands, so If I seated that long, I could not use the mag box, nor could I eject a loaded round without removing the bolt.
So, you have some alternatives to accomplish the same thing, one being a 7/08 AI. I would also have the action opened up to accept a Wyatt's mag box.
If you are bound and determined, get a long action. Then throw a 280 and 280 AI into the pot which are unreal accurate cases.
So, since you can not chase the lands as the leade grows on a relatively over bore case, usable long range barrel life can be short...BIG SURPRISE!
DAA, has a 6/284 hope he chimes in. The 6/284 with zero freebore would shoot the 55-62g bullets in the 4400 fps area, and if a guy only uses the rifle hunting, then the barrel has many years of use with this set up.
Everybody gets all gigged up over a short action and its weight, but there is only 6 oz diff in a long action and short action. I even put my 257 Roberts, 6 Remington on long actions...marriage made in Heaven.
Best wishes