other
We had a "rifle for turkeys" thread running not to long ago.
The common advice as I've always heard it, from old timers in a state where turkey hunting with rifles (fall season) was legal, was to aim for the "butt of the wings", ie, where the wings join the body. A solid hit there will be behind the breast meat, which you want (to eat), destroy the lungs, and likely clip the spine as well. I'd estimate the vital area there about the size of a softball, maybe a tad smaller. If you break the neck where it joins the body, you certainly will have a dead turkey, but the vital area there, for a rifle bullet, is much smaller, say golf ball size, maybe a tad bigger (racquet ball?)
Never thought about a .357 carbine for turkeys, but loaded right, it may well be a fair choice. My own opinion would be for a mid range (1100 fps or so from the muzzle of the CARBINE) lead, SWC design. I'd choose a heavy slug, 158-160, and avoid high velocity HP's, as to destructive for a target that won't weigh more than about 20 lbs. The equation above may well translate into some type of reload. A hot .38spl, SWC from the carbine, may do as well. I shot quite a few groundhogs with a Marlin lever, , and or a 6" revolver, & .38's back in the day, using factory 158 SWC.
Much as I don't really like the look on a lever carbine , a low powered scope would be an asset, duly recognized now that my own eyes have slippped a bit. I'd give some thought as to what range to zero. "On" at 100, may well put the slug higher at 50 than is practical. Maybe "on" at 75, and hold a tad high at 100?
Good luck.