My very first "custom" build was a .25-06AI.
I bought a pawn shop R700 carbine .30-06 that looked like it was a truck bed gun. As in bounced around in a truck bed a while.
Ditched everything but the action. I told the gunsmith to "square and true the action up".
Had a new 28" Lilja #4 1:10" chambered in .25-06AI, put a Bell and Carlson fiberglass stock on it, a Shilen Match trigger, and topped it with a Leupold Vari-X III 6.5-20×50 LR.
It shot 3 different loads.
100 SMK @ 3600 into .6s.
100 TTSX @ 3600 into .8s.
115 VLD @ 3450 into .5s.
I killed a lot of coyotes, and we killed quite a few mulies with it out to 488 yards.
Once I shot that barrel out, I rebuilt it into a .280AI.
When the gunsmith took it apart, it looked like the previous gunsmith had "squared" the action with a hacksaw by hand. So the new gunsmith actually did it right, opened up the threads and cleaned everything up like it should have been.
Installed a new 26" 1:9" Proof CF Sendero Light, new Manners EH1 w. Pillars and bedded, a bunch of bolt work, and a new March F 3-24×52.
The .280AI shot 175 Elites @ 2975fps into .2-.3s routinely. Killed quite a few pronghorn, deer, and elk with it over the years.