Of course there is crud build up from Pyrodex Pellets or loose. The advantage is, the fowling is soft and will usually swab right out of the barrel. Also if you shoot Pyrodex pellets and Triple Se7en pellets, there is no advantage in power between them They reduced the size of the Triple Se7en pellets so they are approximately equal in strength to those of Pyrodex.

And granted you can clean up Triple Se7en with simple water, but you can do the same to Pyrodex with simple water and a little dish soap. There is just more fowling with the Pyrodex so it will take a little more effort to make sure the bore of your rifle is clean.

Also both of them shooting will leave plastic, possible lead, and copper fowling in the bore of the barrel. Simple water will remove the Triple Se7en but you still have to use solvent patches to get out the other kinds of fowling.

So the advantages between Pyrodex over Triple Se7en... well Pyrodex is recommended by the maker of your rifle. It is made to shoot three of the pellets with certain projectiles. Also there is a cost savings by shooting Pyrodex over Triple Se7en. The fowling of Pyrodex is not as hard and will come out with a simple wet swab. Pyrodex makes big stinky clouds of white smoke when you shoot it... that is a big plus to all of us junior pyromaniacs, but Pyrodex might take you a little longer to clean out of the barrel.

I shoot Goex, considered by many (not myself) as the most dirty of all powders. It does take longer to clean the barrel and swab the fowling.. my attitude is, so what. I am out there having fun. If it takes me a little longer to clean my rifle, then it takes me a little longer...

You should shoot what you feel most comfortable with... Try some Pyrodex and Triple Se7en and see what you like the best. I personally would shoot loose powder but to each their own... Good luck and be sure and keep us posted as to how you like shooting your rifle. I have a feeling you're going to be hooked big time in this sport.