Not extreme long range but, farther than 200 yards and in something other than 7.62x51, thinking 6.5CM but open to suggestions.  I need enough oomph to reliably take feral hogs 400 yards without excessive recoil for follow-up shots.  Expect ~1MOA with "normal" commercial ammunition.  Thinking in a 20" barrel and a midweight profile to keep the package weight with a suppressor and heavy thermal reasonable because a 17+ pound rifle sucks, especially with a heavy can and long barrel.

If I "LEGO" an MWS-H heavy upper with a reasonable barrel, will I get what I am looking for?  Or do I need to work with a known builder to get what I need?  With a ~$1300 upper, ~$800 barrel assembly, and a bolt, I am thinking a complete shrink-wrapped upper is a better option initially.

I don't think less than 6.5CM will give me the terminal performance I need.  A 6.8SPC with a bit more oomph for longer range seems to be the sweet spot but, 7/08 might be worth consideration.

I know the 8.6BO is the new darling of Social Media likes but, subs at that distance seem problematic.  Less than 6.5CM seems to be a bit light at the distances I need for a tough boar.  A flatter trajectory never hurts assuming all other factors are similar.

Thoughts and suggestions for my MWS-H complete lower?

TIA,
Sid

I’m a big fan of the LMT MWS platform.  Just know that even with the MLOK uppers they can get heavy quick as do most large frame AR-10 platforms. If possible buy a complete LMT upper and lower.

If staying with 308 a 16” CL 7.62 barrel will get you there.  For hunting with a can I’d go with a 13.5” CL 7.62 barrel.

I had a 20” 6.5CM SS barrel and sold it. It was a tac driver  but with a can it was a dedicated bench gun.  Trying to snag a 14.5” 6.5CM barrel from D Wilson.

https://www.youtube.com/watch?v=WX1kNtalmFw

https://www.ar15.com/forums/AR-15/LMT-13-5-at-1100yds/121-734524/?page=1&anc=bottom#bottom