Re: 22 mag vs 22lr
.22WMR runs 1700-2100fps, depending on bullet weight. The 40gr runs 1850-2000 or so. I haven't looked at a chart lately, but suspect it goes trans-sonic well over 150yd.
With hollow points its pretty destructive on small edible game.
We've shot a bunch of turkeys to about 125-150 yd. But I've killed turkeys with .22lr solids also. I mean, you can throw a rock through them.
As a field gun, the main benefit is the flat trajectory, as noted above.