It’s no big deal to screw on a 458 barrel on any push feed magnum receivers. Controlled feed might need a little work.

I just sold my 77 tanger 7mm RM. It would have been a candidate to send off for fitting a 458 barrel on.

I prefer classic.
Semper Fi
I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally