Slang.
My old man always had old Jack O’Connor books around when I was a kid, so I grew up reading all of them. A pre-‘64 M70 in .270 Win is on the short list, just to put in the wall and enjoy.
I’m speaking in more generalities than anything, nothing specific about your own abilities.
Think of the whole shebang like a system… me+rifle+scope+ammo… inevitably, you put the rifle and scope in a sled and shoot the ammo you’ll have a more accurate system than the one including me.
He's not wrong.
As much as it hurts my ego to admit, in any/all situations involving me and any of my rifles, I'm the weak point. Best way to work on that weak point is to shoot. A lot.
Whether you're starting from scratch, or modifying your current .270, you can't go wrong with step one being the Tikka. If you're going to go all in on your current .270, I don't think you need "a better barrel." Maybe just cut/thread it for your light weight suppressor, and no need to upgrade...
If you're going off the shelf, Seekins by a long shot.
But I would propose a different path so you get the full custom experience... Tikka action (maybe snag that .308 that's for sale here already) send it to @p_ham and just set your budget and tell him to go crazy with it. He's an artist, let...