Husky, Thanks. My 375 shoots 300g bullets vs the 416's 400g bullets. That is a pretty big difference flying out of the end of the barrel. I bought the 375Weatherby very lightly used and the guy who owned it previously was a lot recoil sensitive and put less than 5 rounds thru it and sent it to a smith to have it braked. The brake was installed and it did not cut the recoil enough for him after 5 more rounds. Back to the smith it went and he asked the smith to make the brake more effective. Well the smith opened up about every other or every third hole in the brake to allow more gas to escape laterally. A few more rounds and the original owner said no mas. So I got it for a song with about 15 or less rounds run thru it but the muzzle brake looks a mess. I have not shot it yet with the thread protector on it only the muzzle brake.
I have not chronoed the 375 Weatherby yet however I expect it to be pushing the 300g bullet at about 2850 or so.
My 416 Rigby was pushing the 400g at 2550. So figure about 5223 foot pounds of energy vs 5775 foot pounds at the muzzle.
Again sorry to the OP. Perhaps I will make a new post in the Firearms section with pictures and stats of my two big bores?