Looking at Hogdgon's chart 777, which is 15% more powerful than Pyrodex, gives nearly 850 fps with 30 grns of powder. Multiply that by .85 and I get about 720 fps for the 30 grns of Pyrodex P I used.

Computing that into the ballistics calculator it shows 165 ft/lbs. That's not even 380 ACP territory. Why the amount of recoil with a fairly heavy platform? And how are people getting passthroughs on deer using a RB?

1000 fps only gives ~320 ft/lbs (RB), which drops quickly as the distance gets out there (275 ft/lbs @ 25 yds and 242 ft/lbs @ 50 yds), which hardly seems enough for a passthrough, especially with such a light and easily deformed projectile.