I researched the 30 AR and brass appears unobtainable. Never heard of the 375 SOCOM. Usually the lightest bullets for that bore is 200-235. H&H bullets are going to be like a FMJ from an AR. I could see the 35 SOCOM and use 150gr pointy bullets.
Maybe a Grendel necked up to 30 cal. Oops - I guess the 7.62x39 has been around for a long time, why reinvent the wheel.
I've got time to decide - maybe. If the b!tch or the "business man" get elected, I may have to buy the parts right now.
