Cons: The action it not inherently strong. They tend to stretch when large bore, high pressure cartridges are used. Hence the extra metal on the encore. (note-the contender trigger is better) I had some beastly chamberings attached to my frames (375 JDJ) and 30/30. They were loud, blasty and beat up the frames. Fortunately, breech faces can be replaced and shimmed to put things back in order. However, it just doesn't make sense to push such a lightweight gun to such a limit unless you are hunting for large game and need to reduce weight. Both headspace problems and aging springs can cause weak primer strikes.
Most of the barrels available are 10's 14's and 16inchers, which are really blasty If you are using rifle cartridges. It is best to stick with carbine or pistol cartridges (or parent cases) which have less backthrust. Also, rimmed cartridges are much more user friendly because of the extractor geometry necessary to engage a rebated rim. This is why 2 out of the 3 barrels I still have are rimmed. Also, the stretchiness of the action allows the brass to stretch a bit more, so resizing and trimming are critical. There is a reason that steeper shoulders are popular with these guns. It slows the flow of brass. The biggest downside is that they are addictive. I have spent a lot of money with all the switching and tinkering. I have tried to upgrade and simplify my tools over the years, but I cannot seem to part with my super custom, completely tailored briefcase of contenders.
To learn ore about them, check http://www.bellmtcs.com/store/