EX, I have been shooting the TK2000 for a couple years now. I shoot 100 grains Triple 7 fffg, 3 1/2" shot cup, custom wad padding(I designed), over powder wad, and a over shot wad. But, with all guns, they shoot differently. IMHO, Don't use no more than 100 grains of powder. From all the input I have received from TK2000 owners, all you will get is a blown pattern.
PS: here's a pic of a bird
"HAMMERED" with the TK2000!!