By target shooting do you mean PRS competition? MPA has a new hybrid chassis out. Barricade shooting has challenges and the MPA accessories are built around barricade shooting. The carryover is huge for hunting applications... have a perfect shot at 500 yards, but can't go prone because of terrain, but there is a cattle-gate close by? Then use the MPA wedges... The only problem I'd see for hunting is that the foreguard of the chassis is exposed aluminum and could be cold to the touch. The cheek pad and grip are not cold though. The hybrid weighs 3lbs, so that is pretty good for a chassis. I think the manners carbon fiber ultralight weighs 2lbs.
Personally, I'd go for a two rifle setup. Shooting a lot burns out a barrel. And for longer shots, I'd want more oomph for longer shots than a standard caliber can provide. While it is true that a 6.5 caliber has the same or similar ballistics than a 300wm, it does not have the energy payload of the 300wm. Energy delivered being the key to an ethical hunting shot. There are guys that have taken down elk sized game from 800 yards with a 6.5-284, but using that caliber will burn your barrel out quick... And you'll be going through barrels like mad.
If you did go that route, I'd get an action with an integral recoil lug, as barrel swaps are much easier. But then, an action that has lots of pre-fit support would be optimal. So, I'd consider an action like the Nucleus action (or maybe Insite could make a bunch of pre-fits for your specific action?), where pre-fit barrels are easy to come-by (maybe a little tougher to get the barrels in Canada): "Another plus with this setup is after you burn out that first barrel, you can order a new one from Patriot Valley Arms without having to send in your action. That means you won’t be waiting months on a gunsmith to keep your rifle match-ready. Josh said he’ll be offering those replacement barrels for $500, which is a good deal for a chambered, match-grade barrel with a threaded muzzle" (from the PRS blog write-up on the Nucleus).
http://precisionrifleblog.com/2018/02/10/shot-show-2018-mpa-hybrid-chassis/
http://precisionrifleblog.com/2018/01/27/shot-show-2018-nucleus-action-american-rifle-company/
Here's a quick video talking about LR hunting calibers. Oh, carbon fiber barrels are pretty awesome. I've handled one in 300wm that was 7lbs, and it was weird, because usually you expect them, with their big bulls barrels, to handle like most other precision rifles, you expect them to be heavy. But they are not and it's kind of weird to get over. However, they are sometimes twice, or more, the price of a regular stainless match barrel. I would not want to shoot one for target shooting as it would burn the barrel out too quickly. That's why I personally am opting for the two rifle setup. A carbon barreled precision/hunting rifle and a dedicated competition shooter. Anyway, there's my two cents.
https://www.youtube.com/watch?v=9KQcyNeaOCQ