I was wondering about a tried and true load with the 350 Rem Mag for a Nosler 225 gr Partition? Preferably a powder with copper removing capabilities. CFE 223? TIA and Be Well, Rustyzipper.

In my 350 Rem Mag, I use H4895 with a 225gn Sierra.

The 350 RM and 35 Whelen have nearly identical case capacities (per Chuck Hawk's website):

.35 Whelen (R-P): 72.6 grains of H20
.350 Remington Mag. (R-P): 73.7 grains

Use Speers data for the Whelen and the 220 gr bullet that uses CFE 223 as a starting point minding safe load workup protocol:

https://www.speer-ammo.com/download...35_caliber_357-358_dia/35_Whelen_220.pdf

I had good luck with 57 gn of TAC or 56 gn of 8208.

Cheers,
Walt