50 grains of powder in a pistol sounds on the upper edge to me, especially in a smaller caliber pistol. If you are using black powder I doubt that the barrel length is long enough to get anything near a complete burn, so you are just wasting powder and adding to the weight of the charge. If you use a substitute like 777 the story changes somewhat but then you might have to worry about barrel pressures, especially with anything other than a round ball. 25 to 30 grains of 2F or 3F should be fine. Also, I don't see the point in using conicals. Besides the fact they are more expensive I doubt they will be more accurate. Pistols often have a faster twist rate than BP rifles of the same caliber. The reason is that with down loaded powder charges the muzzle velocity is not high enough to effectively stabilize anything other than a round ball. At pistol shooting ranges you will likely not see an improvement in accuracy with a conical, and it may even be worse. Remember, projectile stabilization is more strongly dependent on revolutions per second, not revolutions per distance traveled. If you use conicals, use a very short one like a ball-et.