I have a late model Model 70 in .300 WSM I want to convert to a box feed. It is on a HS Precision stock if that matters. My question is who? Accurate Ordnance here in ATL is no longer or they’d be the obvious choice. I would rather not ship it, but may not have a choice. My internet searching has not come up with much at all.
Any ideas?

Also have that model in a heavy barrel .243 Winchester.
Just for extra capacity I take it? Just curious as to why you'd want box feed.

Yes,more capacity and easier reloading.