max loose powder load is 100. This is due to the fact that winchester says this is close to maximum powder charge they can get to burn out of the 26" barrel. Winchester told me that i could go up to 110 but they said there will be unburnt powder coming out of the end of the barrel. And i agree with them. Ive done 110-120 and 150 grain Loose powder loads and it just makes a pretty sparkler show. They are also rated for 150 grain "3 Pellet" Loads.

What kind of bullet do you plan on shooting? Powerbelts or the 285 grain great plains conicals would be a good starting point.