Some time back I posted a link to the manual for the Winchester Apex. That document issues this note about powder charges.
Note: All Winchester muzzleloaders are rated to shoot a
maximum of 150 grain equivalent of pelletized powder. The
maximum recommended amount of loose powder
(Blackpowder or approved substitute) is 100 grains by
volume. Never use any amount of smokeless powder.
I do own a CVA/BPI Kodiak and I love the gun. I shoot the magnum load of 3 50 grain pellets of Triple Seven for now. I have posted concerns about this load and decided that I might change when I get time and money to work up a load. With temperatures in the 80’s where I live it is time to think about fishing.