Be careful with some of these powders. 777 is 15% hotter than pyrodex. If your gun is a "magnum" rated for 150 grains of black powder or pyrodex three pellets of 777 is too hot a load. A 209 primer is way hotter than a #11 percussion cap as well.
If your goal is to make a high power rifle out of your muzzleloader going with hotter loadings can be counterproductive as Jason states. What velocity increase you gain you will likely lose in accuracy. The result is that you can't shoot any further due to potential loss of accuracy. You might try lighter slugs or the same slugs in a smaller caliber. As an example, Precision Rifle makes bullets from 180 to 350 grains in 40, 44, and 45 caliber. With 110 grains of 777 and a 175yard zero they quote:
180 grain 40 cal. bullet -- 200 yards -- 1613fps, 1040ft-lbs, -2.4". (+2.9" @ 100 yards)
250 grain 40 cal. bullet -- 200 yards -- 1540fps, 1316ft-lbs, -2.9". (+3.6" @ 100 yards)
Switch to a 250 grain bullet in 44 cal -- 1432fps, 1139ft-lbs, -3.2". (+3.9" @ 100 yards)
As you can see, the better BC bullet in the weight range you want wins out. The 250 grain examples above have the same muzzle velocity. They say you need 800 ft-lbs of energy for deer. Even if you used 1000 as a minimum even the 180 grain 40 cal bullet does the job. By searching for a better BC bullet you can increase performance without boosting the charge and likely preserve accuracy too. Or just go simple and limit your shots to 150 yards with whatever you are using.
Jason, congrats on the buck. Anything to write home about?