Hoping to hear more on these builds. Curious about the PVA 7/6.5 barrel vs the Blue Mountain. I'm considering getting a Zermatt medium action and I don't know if PVA's would spec well with a MA or if it'll only do well on a SA. I love the idea of being able to use MDT MA 6.5 PRC mags for 10 rounds of 7/6.5 PRC where as 7 PRC would only have 5 in a CIP mag. I know that AI makes a 10 round magnum CIP mag so I could just go 7 PRC for 10 rounds, but that magazine looks insanely long (haven't been able to find a spec on the length yet). The MDT MA mag looks much more manageable. Additionally, I'm thinking the MDT MA 30.06 mags can likely run 308 and 6.5 CM without issues.
However, I wouldn't say 7 SAUM brass is unobtanium, yet. You'd likely be using ADG brass instead of Lapua. Will most shooters notice a difference in brass quality? I think 7 SAUM ADG brass may offer more grains vs 6.5 PRC brass necked up to 7mm. That should give extra velocity and ADG is still quality stuff.
I'm also wondering if it's even worth it for a 7mm... 156 gr 6.5 PRC factory Berger ammo has less drop and wind drift at 1000 yards and you're only giving up ~75 ft lb of energy. I know 7 PRCW, 7/6.5 PRC, 7 SAUM, and all the similar variants are very popular in F Class but I'm too ignorant to understand why they aren't shooting 6.5 PRC... Something must be going on in real life that the calculator isn't accounting for.