Your group with 150 gr Nos Bal Tip is smaller than mine.
My 7mag, 150 NBT, Win brass, 215M primer, IMR4831:
necks turned, each charge weighed, arguably one of my best loads in my shooting history. Barrel is Shilen Select Match
I have the bullets, the brass, the powder.
OK, I can have Brownells send me one of the barrels, but they only stock select match in some fat taper, so I can get one from the barrel man.
I have the reamer.
I can get the primers, I can buy another neck turning device.
Something tells me I will not get that small a group.
You are using Rem700 actions and Jewel triggers?
I prefer a VZ24 action and Keplinger trigger, but that can't make that much difference.
Are you using a variable to 10X scope?