Hi Kyle, I Really like the Browning A Bolts, lots of great features for a PG or standard hunting rifle (except so so trigger) I have a few of them & Sako 75-85s .
I to was going to rebarrel a magnum action to .458Win, looked into it a lot way back.
They have super fine barrel/action threads & sometimes these gall when taking the barrel off, so much a lot of Smiths who have done them won’t do them again !
I think a big part of the reason you don’t see a lot of custom or rebarrels on these.
Another more obvious thing is the push feed action, no matter how you feel on these yourself, if you put a large amount of money into one you will be unlikely to get it back on selling it.
If you would like a Left Hook for your DG rifle & don’t mind a Winchester M70 (post 92) which is a great rifle, finding one of these could be a great option to rebarrel ?