I'm using Nosler brass, 215 Federal primers, with 88 grains of Retumbo behind the Berger 215's and getting 3045 MV and sub 1/2 MOA groups. This is in a semi-custom Sendero with a 28" Douglas barrel. For some reason the 230's would not shoot accurately in my gun but the 215's shoot great. Hope this helps and good luck!
I'm using either 98-102 grains( depending on what you can fit in- 102 is dang compressed) of rl50 or 95 grains of rl33 with the 225 hornady in the 300 rum sitting in rem brass with a 215. I'd try letting her jump a bit first; works fine in my barrel and both the 7 and 30 rum's really seem to want a jump from what I've seen.