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Man, I hate to say it and sound like a dick, but if you have to ask this question, you should not be shooting animals at that range, it's just not ethical.
Yes you can spend the money on a rifle that can do it, yes you can spend a few years learning to shoot long range, and then maybe you could take SOME shots in perfect conditions and that would be ethical.
I'd argue that if it has to be a shot at that range because you don't have time to walk 300m closer, you're going to be under too much pressure and can't guarantee a good kill.
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Stretch the 270win,sounds like you know it well.Find a long lonely paddock and let ripped.You still gota walk to the animal,do it befor you take the shot.Use the 270 you know well.
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yes from all accounts the 145grn superpreformance loads really shine in good ol .270win Im assuming you have a rangefinder??? without one,anything past 350-400 is really a guessing game.....
that offer to try both out is a really good and generous one...MAKE IT HAPPEN....its the only way you will know.
Ive got a 7mm mag and will never use it...the .270 does a fine job out to 350-400 and I dont own rangefinder so that rules out anything further for me.
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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.