I guess I should have added that I am wanting to keep the pelts in as good as shape as possible.
I'm thinking the above and this:
I hunt them with 7WSM using 150 Ballistic tips.
are incompatible statements.
The least pelt damage? A leg hold trap, a catch-pole and a T-ball bat.
If you use .22lr out of a pistol, you won't need the catch-pole and bat, but the pelt will have a hole in it.