You can use 777 in your Remmy. Remember that 777 is about 15 percent stronger than other substitutes, and adjust your charge accordingly. I don't know what difference using 777 FFG as opposed to 777 FFFG, will make.
As has already been pointed out, C&B revolvers need pure lead for their balls/bullets. When the gun fires, the ball enters the forcing cone and is swaged down smaller. If your bullet's too hard, you'll be slamming the frame pretty hard, every time you fire. That'll stretch the frame and shorten the life of your gun, perhaps quite a bit.
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