PVA Osprey’s are a solid choice and available as prefit for Impact. I didn’t understand the difference between a good barrel (factory Tikka, Seekins, MPA) and a great barrel until I bought a prefit 6CM from PVA. No weird flyers with factory ammo, just one shot after another into the same ragged hole. I’ve never had that experience before, and I don’t do anything different with that rifle than I do with others. Maybe I got lucky, but based on what I have read I believe it ‘s the barrel. When you get group after group all the same, you realize there’s a difference. The consistency of a great barrel is eye opening when you first experience it.
Sorry, I posted this before I saw that you already purchased from Altus. Enjoy the new toy!