Re: best edge actions
I would use a 9 lug Weatherby MK V in .300 Wby or .340 Wby. The factory mag box will handle a 3.8" C.O.A.L. You can find a donor rifle that will have everything you need, except maybe a better trigger, for less money than a custom action by itself with no trigger, mag box, follower or bottom metal.
The rifle will still be a custom no matter which action you choose.
Good luck, Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member
A big fast bullet will beat a little fast bullet every time