I see little difference in a 375 and a 416 Rigby or Remington, in the recoil department..I do see a lot of difference in the 458 Lott, that is where the word recoil is redefined...

In the real world of hunting one must shoot from varied and awkard postions and the 458 Lott and up can literally knock the snot out of you...Most 458 Lotts only get shot at the range or take up space in someones gun cabinet while they claim the recoil is merely a maidens carress, not so IMO......furthermore I cannot imagine anything that I could not kill with a 416, and have done so...

A 375 H&H in 99% condition will bring $2000 to $2200. with hang tags and as new or new will bring $3500. In the condition you describe which seems to be about 90%, I would give $1500 ot $1600. for it..but not sight unseen.

The pre 64 Win. or a good used custom Mauser set up correctly is a far better rifle than anything on the new modern market IMO...