Not necessary to use the wad, but it would not necessarily be a detriment. However, personally, I oppose the use of maxi (or any kind of bullet) for ml hunting. My early experience with a TC 'hawken' and TC maxi balls was scary. In many parts of the country (southern Indiana for me at the time) ml deer season is usually early fall. Meaning, the mornings can be quite cool and temps rise sometimes to low 80's by noon. The barrel steel and lead projectile will expand at different rates and the bore lube can/will get soft. I found my maxi slid down the bore from carrying the rifle with the muzzle pointing down. That required reseating for safe shooting. For me, the possibility of failing to do that and having a disaster put me off of using maxi/mini/etc. bullets for the rest of my ml career with rifles designed for prb use. For the record, my deer killed with round balls ended up just as ded as they would have been with maxis.