I'm still looking for it, I use Hodgdon Triple Se7en pellets. Can't remember if it was in my manual for my muzzleloader (Traditions) or in the pamplet that came with the pellets. I remember reading that 1 50gr pellet was minimum charge recommended if just target shooting. When I find it will update post.
This found on Hodgdon's website:
Performance of TRIPLE SEVEN PELLETS is incredibly consistent! A single 50-grain Pellet is good for light target loads or small game loads while two 50-grain Pellets may be combined to provide a potent maximum 100 grain equivalent load for big game. Just drop a Pellet or two down the barrel, seat the projectile, cap the rifle and shoot!
50 Caliber - 50 Grain Pellets The original Pyrodex Pellet designed for use in 50 caliber, in-line rifles. A single 50/50 pellet may be used for a light target or small game load while two 50/50 pellets may be combined to provide a potent 100 gr. equivalent load for big game. Packed 100 pellets to the box and 24 pellets to the card.
Under the 30gr pellets they don't mention using a single 30gr pellet. Under there load data they don't show any loads lighter than 80gr. I know this isn't an issue for you anymore just trying to find the answer myself. I can't find my muzzleloader manual (Traditions) but swear it had a statement in there about 50gr (pellets or loose) as a minimum charge. Still looking for it.