Shorts and Longs were 1:20, Long Rifle: 1:16. My rifle is chambered in Long and has a 1:20 twist. I shot it this AM with shorts, longs, and long rifles. The rifle shoots OK, but is by no means a tack driver. But, at 50yds off the bench, the LR groups were half the size of both the Longs and the Shorts.

Go figure.

https://winchestercollector.org/forum/winchester-shooting-and-hunting/22lr-in-22-long-firearm/