Re: .22 WMR vs. 17 HMR
You head/neck shoot turkeys with 4s, 5s, or 6s, and a tight choke.
Turkeys heads rarely hold still long enough for a head shot with a single projectile.
For spring turkey, slugs would be illegal for safety reasons. Full camo, decoys, making sounds like game, baaad juju.
And like the man said: turkey pate'. Geez, you can throw a rock through them.
Where legal, .22LR, WMR, Hornet are superb for turkey (usually autumn). Solves all those problems of birds that hang up about 80yds out, twice the effective shotgun range. The .17s ought to be effective, but you really don't want to shoot edible game with exploding bullets. (headshots on small mammals excepted).