Here's a part of a pdf file which shows twist rates for different calibers. I've listed the rifles in .222 Rem. It's possible that it's 1in16", but it's likely a 1in14". 222 Rem works quite well with 50gr weights, but most heavy bullets will not stabilize.
222 Remington - 1 in 12" . . . . . .Thompson/Center Carbine and Rifle
222 Remington - 1 in 14" . . . . . .Browning; Remington 722, 725, 700, 600, 40
XB, 760, 788, 660; Savage 24-V, 340, 112,
2400; Sako; Winchester 70, 770; Wichita; Colt;
Husqvarna; Cooper
222 Remington - 1 in 16" . . . . . .J.C. Higgins 52, early Sako
NCsmitty