That's one of the problems with 777 if you are going to use pellets might try adding a 30 gr if they still make them. Actually most use loose powder for several reasons one it is much easier to set up an accurate load. 110 gr loose or 120 gr loose usually gives both accuracy and good velocity; the pellets are based on pyrodex pellets and are equal to about 85 gr loose[2 pellets] .
130 gr of pellets is equal to 110 gr of loose about where a lot of people find the best accuracy. Lee