I have a Lyman Great Plain Hunter (Sidelock with no. 11 caps). I shoot 777 and 3fg powder in it with no ignition problems at all. I use CCI no. 11 Mag caps. I haven' t spend enough time shooting this gun with 777 to tell you how accurate it is.

As for the recoil, find a good light weight sabot (assuming they are legal in your area). Recoil is noticablely lighter when with sabots than conicals, and keep your powder charge to a minimum.