Just "best US made" Africa rifle? No qualifier?
Full custom, or very limited series, rifles built on Granite Mountain actions.
Best US made factory Africa rifle?
Factory rifles built on Winchester 70 action or one of its clones (Dakota 76, Kimber Caprivi, Win 70 Safari Express).
Best US made rifles built on foreign action?
Full custom rifles built on magnum Mauser 98 or highly tuned CZ 550 actions.
Honorable mention...
If the Montana Rifle Co PH action survives Chap 11 restructuring, it would be - in my opinion -
superior to all other Win 70 action clones because it includes scope mounting dovetails in double square bridges. This eliminates the issue to scope bases often shaking loose after 100 rounds or so in .40+ DG calibers.
Yes, it is a cast action, and traditionally forged actions are more desirable, but there seems to be enough evidence that modern cast actions are strong enough...
PS: the current Win 70 is
assembled in Portugal, but I seem to remember reading somewhere that the action is machined in the US (?) Can anyone confirm based on facts?