I'd personally avoid the 300win mag in the Tikka. The lack of magazine length will make fitting the high bc projectiles hard, and being an 11 twist barrel they'll loose some bc due to being marginally stable. The 7 mag in the Tikka is a better fit but still not perfect. You could go 300wsm and modify the bolt stop and magazine to have the length for long projectiles.
Ammo or components availability would not be a major consideration for me. The reality is all of it is hard to get with no signs of improvement, pick the stuff you want and put it on backorder so you at least get in the queue. Then take what you can find in the meantime.
One last thought, investing the same money in ammo (and possibly a new scope) for your .270 is probably going to have a just as good or better outcome. But buying new guns is always fun.
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