I totally agree with Johnn and I applaud your effort in this project, had your work surfaced earlier concerning the use of 300 Win. Mag. brass in the Ruger I might still be persevering with my Rugers instead of giving them away in frustration.
However I still have a few Mausers and a couple pre-64s which either of could become 375 Rs.
I was gonna make one into a 30 Newton which is probably what the 375 Ruger was copied from to start with.
Keep up the good work Douglas and by all means keep us posted.... Thanks my Friend !
Why bother Kevan - the REAL KING 375 H&H is a better cartridge then the imposter 375r anyhow !