I've never tried a powerbelt.
The only concession concerning projectiles I've made so far is to buy bullets someone else has cast (No Excuses). Otherwise, I've cast my own, just as I do for my .44, my .45 and my 30-06.
Oh, I've reloaded some Sierra Game Kings thinking it'd be an advantage, but at the range that game is taken here in NW Florida (rarely over 100yds,because the brush is so thick) my home cast bullets work great!