Welcome to the wonderful world of Walker! I use mine in competitions...with a .454 ball and a pre-lubed ox-yoke wonder-wad between the powder and the ball. No lube mess for this guy! Especially in the cold weather, the pre-lubed wads are the best! Good in the hot weather too! 50 grains of 3Fg Goex seems to be the most accurate. I can push 55 into the chambers, but all I get is more muzzle flip and flash and the groups tend to open-up some, so I keep it to 50 grains!
The normal sights are preset for approx. 75 yards, so you have to aim approx. 6.5 inches low to knock-out the ten-X ring at 25 yards! I'm fortunate that my Walker is dead-on left to right, so I just aim 6.5 inches low and make things disappear! On several occaisions I hit a gong at 135 yards with the Walker and the 50 grain load from above.
The most important thing to remember with C&B revolvers is a uniform loading discipline starting with throwing all of your charges at home, using a good powder measure, and tapping the powder measure and topping-off the measure the same way each and every time that you throw a charge! Next comes the tubes to put the charges into...I use the little red ones from RMC in PA. After that comes making sure that all of the powder from each and every charge gets into the cylinder's chambers and isn't spilt in any way. Next comes the use of a loading stand so as to enable you to obtain a very uniform seating pressure on the charge and the ball.
There's a lot that goes into making any BP revolver a real tack-driver, with experience being the best teacher! Good luck with yours and let us all know how you're doing and we'll all be here for more advice!
If you want, send me a PT with your email info and I'll send you some of the articles that I've written for two of the Clubs that I belong to.
Have a great New Year!
Dave