Pressures using large charges of 777 orPyrodexcan approach or exceed 25,000 psi. This is in the lower end of centerfire rifle pressures and care must be taken. i used to use130-150 grain charges ofPyrodex RS and found that they were not needed. At charges of over 100 grains of Pyrodex RS one is working withthe law of diminishing returns where a lot of the powders energy is wasted because it burns outside the muzzle of the gun or not at all.

i willsometimesfire my CVA Stag Horn muzzleloader it at the end of the day in low light to check the zero. The target is always a rock. My load was alwaystwo 50 gr. Pyrodex pellets and the 240 grain XTP. There would be no visible fire or smoke from the muzzle, indicating that the charged burned completely in the 24" barrel ofthe gun. Killed acouple hogs with my CVA Mag Hunter late in the day using three 50 gr. Pyrodex pellets. There was 6-8 feet of flame from the 26" barrel, indicating that much of the charge burned outside the barrel.