Gerald Stewart’s reply:
I use a 22.250 55 grain hollow point, but I am only interested in knockdown not pelt damage. The .220 swift is pretty good for what you are wanting. You might look to the Internet bulletin boards for some of the conversations about the .17 caliber, which some consider to be good for the best overall predator gun.
Scopes-I have used the Luepold Varix II 3 x 9 up to this point but am excited about the quality of the Swarovski 3 x 10-42 mm that I just had mounted on a Darrell Holland Custom 22.250 varmint rifle. Good luck.