Triple Se7en does leave a crud ring IN SOME RIFLES. I shoot it in the White Ultra Mag and have not noticed the problem even on the 10th shot without swabbing the barrel. When I finally do swab, there is a little something down there, but nothing a swabbing can not take out.

Smokeless powder is illegal in many states, Triple Se7en, and the others are not smokeless. You could always shoot Goex 3f out of a White if you want, and still get excellent accuracy.

The Ultra Mag in you case would be an excellent choice. If scopes are illegal, they are tapped on the side for a Lyman 57SME peep sight for those of you that still need to shoot long distances.

In my White Ultra Mag I shoot Triple Se7en fffg. 75 grains of it with a double wad and then a big 460 grain conical and it will really shoot. I also shoot sabots and load them with 100 grains of Triple Se7en or Goex 3f.

In my Knight Wolverine, I shoot 100 grains of Goex 3f and a number of different sabots with excellent results. If I want to shoot SSB's I then use the White or my Black Diamond.

There are a lot of projectiles out there to choose from. Welcome to the forum..