I don't shoot my sidekick as much as some of the posters here I guess,, it's mostly for deer hunting in my case. And I realize the 295 hp Powerbelts are a bit pricey,but they group the best out of my gun, and I'll pay the price.
I also have some 240gr xtp sabots that shot a 3 to 4 inch group,,which is pretty good too, and a bit less cost. They also load a lot tighter.
I used to shoot the maxi ball out of my 54 renegade,,and they did well,,may need to try them from the sidekick someday.