Well its not designed for pistols side locks or open breach type inlines so they say; now my experance is that it will work in some TC open breachs but right at the moment I would add an awful lot of Knights to the not working well list, that might change but some how I haves doughts that a lot of the already in use ones will be changed. But all that means is more BH available to the TC users most of which it works very well in. The Knights usually shoot quite well with 777 and I hope some one around here wants to buy 8 and 1/2 cans cheap. Lee