375gn Rocky Mountain bullet in .375 Cheytac - Starting load wanted

[wadcutter]

I have a box of 375gn Rocky Mountain bullets and would like a safe starting load for the .375 Cheytac.

Thinking that around 125gn to 127gn of Retumbo with fed 215 primer would be ok, but would like confirmation from someone who has used this bullet if possible.

Thanks.