WEIGHT is one of the most important things. 3kg to 3,1 kg is the max for a stalking rifle. Once fully equiped it gets heavy. Anything heavier "nude" is getting to heavy.
I handled the M18 on a fair , and it handled like a dream. Light , easy bolt movement, ..... This is the one I would go for from your list.
Plus sub MOA guarantee from the factory.
I have a Tikka T3 lite in 223 and it doesn't shoot so super good as most claim. Just average.
ALL Brownings ( A-bolt II and X Bolt ) that I have seen shot better. This with factory ammo.
My European 7x64 , cloverleaf groups at 100m with Winchester Factory ammo.
Three X bolts ( 243 en 223 ) all shot/shoot cloverleaf groups with factory ammo.
The price of Brownings is excellent. Never consider anything else in the future.
Exept maybe a nice R93 , 30-06 that comes up for sale from a friend who stops stalking.
Less aftermarket parts available for Browning. Agree. But you don't need them.
They are what they should be out of the box.