Have done varmints and predators for many years with my Contender carbines (and pistols) as my primary type of hunting, and most of it at long range. I do have a lot of custom wildcat barrels just for the LR varmints and preds, but also use several factory barrels. Favorites are the 17HM2, 17HMR, 17 Ackley hornet, 17 Ackley Bee, 17M4, 17 Rem and 221 Fireball, but I also use a bunch of 25, 6mm and 6.5mm wildcat cartridges when the winds pick up or the ranges get extra long and have but no longer use several .224 caliber standard and wildcat barrels as well.