A quick update: I finally got to shoot my inline this weekend. My 9 year old grandson was with me, after the first shot all he could say was "SHOOT IT AGAIN"!! He was not impressed with the time required to load it or the clean up after we finished. At 60 yards I was hitting a 3" dia group just off a table, no bags or rest using 2 pellets and some "plinker" sabots I picked up.
I am afraid I have opened up a whole new portal to funnel money into. I really like the whole ML experience!
Welcome to the club..... and don't get too hung up with pellets vs loose powder debate...find what your gun likes and gives you the accuracy you want.
If you are just looking to shoot at paper....bullet accuracy is what you look for. If you are going to hunt game...then you need accuracy and bullet performance (penetration & expansion).
I do a lot of hunting with my muzzleloader and want to be accurate out to 200 yds. My TC ProHunter has a 28" barrel (longer barrels are better than shooter ones) and shoot three 50 gr WhiteHots (primarily for convience and because they give me very good accuracy) with a 250 gr Barnes tipped Expander.
If I wanted to use loose powder and my concern was performance and clean-up....I'd be looking at the BuckHorn 209.
Have fun and think about buying the boy his own muzzleloader