I recall seeing something about 3r not being the best for this caliber, I’ll have to call preferred and see what they use for the bore and if they’ve noted any issues with the 3r and 7 twist.Both of my current .22 GT barrels are 7” twist Bartlein 5Rs with a .218” bore. I went with 7” twist because I wanted to ensure stability with 88gr ELDs. A bunch of folks go with a .219” bore because in flight bullet failures seem to happen less with the .219” bore, but so far, I’ve had no failures.
John