one uses 21-22gr of powder for 3100 with a 50gr VMax/SP
one uses 33-34gr of powder for 3600 with a 50gr VMAx/SP
45-50% more powder for 15-20% more MV
Do the deer know the difference? No
I have shot the .222 for a few years and shot a lot of roe with it.
Personal choice but I use 60gr Hornady SP over N133 for a pleasant 3000fps
a 200+ yds roe is not a problem
Cheap to feed, pleasure to use
Somewhat facile, albeit your post is nearly 18 months old. Though nothing fundamentally has changed in that period. Turn it around, using your numbers:
3600 fps vs. 3100 fps is 35% more energy at the muzzle. And 500 fps faster. Both of which are huge differences.
34gr powder vs. 22gr is 12gr more. Even at say £50 for a small 1lb/7000 grain tub, that's only 8.6p more per bang. Probably, realistically, rather less. So, over 100 shots, the 22-250 costs no more than £8.60 extra to run, vs. the 222. Is that really a deal-breaker for you ?
For which you get faster, flatter, and higher energy at whatever distance. Of course you may download 22-250 to equivalent 222 velocity/energy/powder cost. Though that would be missing the point.

