The manual recommends 90-120 grains of loose FFg powder for best accuracy unless loading with pellets.
Since you're using FFFg 777 powder, that load can be reduced by 10-15% to be equivalent to FFg.
777 has a little more felt recoil than some other powders.
That's why it's good advice to begin with 75-80 grains of powder and work up in 5 grain increments until you're satisfied with the accuracy at the desired hunting distances.
The manual does say that up to 150 grains of pellets can be loaded, but that lower charges of loose powder should be used for best accuracy.
Be prepared to swab the bore every 1-5 shots depending on the amount of residue in the barrel.
The more powder loaded, the more fouling and the more felt recoil.
The more shots taken without swabbing, the harder it will be to ram the bullets and seat them on top of the powder.
Make sure that the bullet is always seated on the powder firmly and that any hard fouling does not interfere with seating the bullet directly on the powder.
Sight your gun in so that the 1st shot out of a cold, clean barrel will hit to your point of aim (or point of zero), since where the 2nd or 3rd shot hits is not as important as the 1st.
Get to know the trajectory of your bullets at different distances to see where they will hit at 50, 75, 100 yards and beyond, to compensate for bullet drop or sighting errors.
Sighting in 1-2 inches high at 50 can reduce the amount of bullet drop at 100 or beyond.
Don't over-compress the 777 when ramming the bullet as that can cause erratic performance.
Ram the bullet firmly on top of the powder, and try to ram it with the same consistent pressure every time for best results.
Read the manual and good luck with your new Wolf:--->>>
https://cva.com/wp-content/uploads/2018/04/Universal-Manualrev11.20.15.pdf