9.3x57 has a good point concerning the Marlin and perhaps it would be one of the very best 'charge stoppers'. I've had two in the past, a .444 with 300gr. and a .45.70, microgrooved 22" with 350's and 400's. Recently, I've come to know a Guide Gun in stainless that puts out 400gr.Barnes FN's just over 2,000fps, but recoil in the light gun is a bit much for really fast cycling. Any of these would work well on cats I'm sure. 9.3's lighter 400gr. cast HP (or jacketed) at just over 1,600fps would be more controllable, less recoil and faster for repeat shots if necessary - probalby not necessary. With a modicum of good practise, that lever gun is just about as fast as a properly exersized Lee Enfield.

Personally, I'd probably go for one of the 9.3's or a .375 something. Those 300gr. Interbonds look to be perfect!