Hello Oldbrit,

Thank you for the info. Yes, I do have Grame Wright's book. I have been using R15 with my 9.3x74R and have has good success. I expect I'll be trying it in this .375 at a starting load of about 45g with a Speer 270g Spire Point.

I've shown here a .375 x 2½" Nitro Express compared to a 38-55 Winchester. You will note that this .375 NE cartridge is loaded with a vintage 300g "Silver-Tip" just in case I need it for one of those "Vampire" deer.