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The best thing to do is use the 3f loose powder , not the 2f or the sticks , 2f is gravel and sticks do not compress well not to mention you can't adjust your grainage amounts using the sticks, also clean your gun out with alcohol before you load the first time an do not use any lubes while shooting it
I have been shooting it for @ 7 years now, I have killed every deer I have shot at with it , I did have to play around with the load amount to get what my rifle liked , I shoot a .45 underhammer and my wife shoots a .50 sidelock , as well as our daughters , with no scopes at 100 yards I hit 2 inch groupings with it with every gun we own , but not with the same powder charge every one of them likes something different , that is what is key no matter what type of powder you use every gun is different as well as every powder , It does draw moisture , if you plan on keeping it for long time would recommend sealing it in a vacuum bag like the food sealers , I dont have that problem as I shoot enough that I go thru 5 or 6 lbs a year ....
So find what your gun likes and have fun!!!!