Is that with black powder?

I don't have chronograph results for 100 grains of FFg in my .58 GM barrel. But I do have the following data with 85, 95, 105, 115 grain loads of GOEX.



So let's assume you're getting 1400 fps with your load of 100 grains FFg, and switching to a 120 grain load of FFFg will bump you velocity all the way up to 1600 fps. (Although it probably won't go quite that high.)

This is what the down range energy will look like with each load.

..................______Ft. Lbs. of Energy_________
Velocity.......50 yards.....75 yards.....100 yards

1400 fps.........741............636.............554
1600 fps.........881............718.............620

So yes, you get a bump in energy. But it takes a lot of powder (and recoil) to get there. And I doubt the Moose will know the difference.