Could have been written better.
Standard .22-250 twist except for Savage's 12" is 14".
Even at that, my 14" Rem. 700 likes the 62gr. Nosler Varmegeddon that they say needs a 12" twist.

No reason a .22-250 with 7 or 8" twist chambered rifle couldn't not be throated for the long bullets .

Of course, THAT is where the .220 Swift comes into perspective in bolt guns. All of the RP .220 Swift brass I measured, ran a maximum of .0015" out of round, right to 1" above the extractor groove. Most were spot-on, .0000" x .0000" wall thickness.

The .22-250 would easily work on an AR10 platform with long bullets of course, if one thought they needed a semi-auto.