Trappererick: I have a bunch of Varmint Rifles in caliber 222 Remington but most of them have long heavy barrels.
I do have a pair of Remington 700 Classics in 222 with 24" barrels though.
One of the Classic prefers AA 2015 powder and 40 grain Sierra Blitz Kings and the other prefers H 322 powder and Nosler 40 grain Ballistic Tips.
I use Federal 205 M (match) primers in both.
Best of luck with the short barreled 222!
By the way do you think that is a factory 20" barrel or did someone "shorten" it?
Hold into the wind
VarmintGuy