Just depends on what mag well he's running. If he's got a M5/DBM bottom metal he can get Accurate Mag without the binder plate which allows for 2.99 OAL. I run my 308 this way have load I run at 2.95 OAL. Feeds fine.For a standard 700 short action, the mag length is 2.850 if I remember correctly. The OP obviously wants to shoot bullets heavier than 95 grains.
If you look at Bergers offerings in hunting bullets, the 108 EH and the 115 VLD's stand out since he will be using a 28", 7 twist barrel. So to keep from encroaching on powder space, I would likely set it up for the boat tail/body junction of the bullet to be at the base of the neck of the case or slightly above to avoid a doughnut.
243 Win case= 2.045-1.804(shoulder/neck junction)=.241 neck length.
Berger 108EH oal= 1.260-.185(boat tail length)=1.075
(minus case neck length).241=.834
So, 2.045(case length)+.834 (bullet protruding past case mouth)=2.879 aol.
For the 115 VLD
bullet oal=1.348
Boat tail - .196
neck length- .241
= .911(length of bullet sticking out of case)
+ 2.045(case length)
=2.956 cartridge oal
If you don't mind giving up powder capacity, it would work on a short action. But, if you're going to do that, you may as well start with a shorter case with less capacity to begin with. Just my opinion.
If he's running a BDL he can put a Wyatt's extended box and also run 2.99 OAL.