captzapp,
Ditch the 777 pellets, they have never been consistant in anything I have shot them out of. Pyrodex pellets on the other hand have been very consistant. If you want to use 777, get loose powder and you can work up a load that will work. Just remember to reduce loads by 15%, 85 grains 777 FFG is equal to 100 grains 777 pellets. Not only will you save money, you will be able to tailor your load to find what is most accurate.
Don't shoot conicals with pellets, they don't mix well.