Please correct me if I'm wrong, but I believe that the gyroscopic stability increases at distance because the velocity decreases fast but the spin rate stays relatively the same.
As long as the twist is fast enough to stabilise the projectile the first meters/yards it should not pose a problem at reduced velocities downrange.
That said, I have seen T1x barrels out there from International Barrels (IBI), Lothar Walther (USA only?) and Preferred Barrel Blanks (no a pre-fit I believe).
I'm sure Proof Research and others will follow suit soon enough.
Any good options for European T1x shooters out there?
A nice Bartlein barrel for the T1x would be sweet!
I don't know enough to know if you're right or wrong but using a bullet I pulled out of a case and the bc and velocity tried up so my drops match reality, all the calculators say SK standard plus and Lapua Center x are marginally stable. There's always lots of talk about faster twist rimfire barrels but nobody sells much. Bartlein could probably make one easily but I'm not ready to spend that kind of money on this gun when it's already sub-moa to 100, unless I start shooting nrl22x matches.