Fifteen- twenty years ago I had a Mark X Mauser 98 converted from 25-06 to 375 Whelen. Over a couple years I worked up a note book of data using various powders and cast bullets. Proved to be very accurate and powerful. I never found a reason to try jacketed bullets. I have molds from NEI, Saeco, Lyman, RCBS. The Saeco and RCBS proved to be the most accurate.
Any way, I'm having a Browning 95 converted from 30 - 06 to 375 Whelen, what I'd like to know from the more experienced fellas, what is the relative strength comparison between the two?
My thought is to use the begining loads used for the Mauser and work up as high as I feel comfortable.
Any way any help sure would be appreciated.

I put together a browning 95 scout rifle in a 41 caliber wildcat off the 9.3x62 case. It was carried both for winter caribou hunting by freight dog team as well as moose by freighter canoe:

https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/13233780/3

I don't think anyone has any business running much past 53,000-55,000 psi loads in the browning 95, or any rear locking lever gun for that matter. Theres not much protecting you like a strong, simple bolt action.

Anything more will be hard on brass. A good powder to keep the pressure down with reasonable velocity, would be Reloder 16.

Mainer Thank you for your input,

I suspect extraction might get hard if you run it hot as well. Dave Scovill played around a bunch with various wildcatted 95s. Maybe you can find some data on Loaddata.com or in one of the Wolfe Levergun special editions.

EDIT:

Loaddata.com has data for the .375 Whelen and Scovill. Not sure what the capacity difference is. You must subscribe to view the charges. Barnes has data for the Scovill.

Thank you. I looked in Load Data, didn't want to pay the annual fee, They should have a fifteen minute fee, for folks that only need fifteen minutes to get the info they need.

I’ve subscribed in the past, printed out everything of interest to me, and put it in the binder they sent me. The fee is a bit much, but they have some specific data you won’t find elsewhere; pretty much everything they’ve ever published in their magazines.

Good luck.