Nope go 28” and the Proof Comp Contour or even straight as the weight will help cut the recoil for you and no reason not to go heavy for your use.
No need for flutes either as it will just cut weight. 9 twist would be my choice.
@bohem Josh owns PVA so maybe he will chime in but above would be what I would use.
I think you're on a good path here, my suggestion for 30's is to go 8 or even 7 twist (if you want to shoot really high BC solids the 7 twist isa must).
PVA makes the most efficient ELR bullets on the market. The 212 has a G7 approaching 0.5 and the 241 is 0.545 G7; numbers typically above what is seen in 37, 40 and 41 caliber ultra magnum cartridges and you can shoot them in a standard magnum 30 caliber setup. Somewhere floating around the internet is a video through Scott Satterlee's phone scope of me shooting targets at 1500, 1800 and 2100 yards with the 198's and my 308 out in Wyoming. It was still supersonic at 2100 yards.
I did basically what the OP is talking about a few years back with a 300 WSM and a 7 twist to shoot 241s and 212's. It's extremely capable at a mile and out to about 2500 yards. The only hiccup is the relatively light bullets (210-240 grain 30's instead of 400 grain 375's) don't make as big of a splash in dirt when you miss. Considering the cost of ownership as compared to a 37XC or similar sized case shooting 2x as much powder it's a lot more enjoyable and affordable to shoot.
There's a guy in Indiana doing really well with our bullets in ELR light shooting 7mm and 30 caliber rifles against 33's and winning against 37's and larger even in the bigger classes.
The summary of my advice having done this:
- Pick a caliber that has standard dies and brass available (300 PRC, 300 WM, 7RM, 7 PRC, 300 WSM, etc)
- Shoot a properly designed ELR bullet
- Run a barrel twist rate that will support the bullets for shots into transonic realm (8 or 7 in 30, 7 twist in 7)
You can use a standard stock and muzzle brake and dies and, and, and.
The cost of shooting expensive bullets is minimal compared to how much money is saved using a standard caliber instead of a specialty ELR magnum that still shoots expensive bullets.