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<font color="purple"> I have had no concerns with quality brass in 300 Ultra up. I believe your best bet will be to get the new Nosler custom 300 ultra brass and neck up. Quite honestly I have had no problem getting them to shoot with Rem brass or any other. </font>
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Good info! Everyone was complaining about Rem brass and saying how great the Federal 300 RUM brass is, so I ordered the more expensive (primed) FC brass. It's prettier, little to zero culling; but after I prep the brass (outside neck turn with K&M turner, uniform primers, debur), I can't see any difference at the range. I'll try the Nosler brass.
The 375 RUM kirby built me is a real tack driver (that kicks less than my .243 winny). Would [multi-step] necking up the best 300 brass to 375 work? The way the gun shoots with Rem brass, I don't see what I could gain. The 260gr Accubonds really do a number on boulders. I'll take it on my next gopher hunt and post pic's. I just shoot low and let the dirt/rock shrapnel do the rest.