.17rem, .204, .223 all will get the job done. I have also done them in with a 12ga. seems like your rifle would work, but if your worried about them getting to you, go with something in a semi automatic like an AR-15 in any of the above calibers, and mount a dot or holo sight on it for up close work. My go to cat rifle is a Specialized Dynamics 18in bull barreled 17rem with a 2-7X32 scope, with a burris fast fire 2 mounted on a Predator Tactical 45 deg offset mount for the up close stuff. My rifle is sighted at 40 yards (with DOPE out to 300), my dot is sighted at 20. We got 17 cats this last season, and are up to 4 so far since August 1st, the start of our season. I just took on this weekend with my .223, and the one before that was with a 12ga. All of them have been one shot wonders. Hit'em in the chest, down they go. Only runers taht I have had is if they take it in the mid-section.