powder bushings are easily altered ...as to how much they'll throw for a specific powder....
spin them in a lathe or drill press ....and lightly, with some emery cloth --- open them up a little / until you get what you want. Use a permanent marker - to remark them -- or a Dremel tool if you want...
You can tighten a bushing up as well....by using some clear nail polish ...let it dry inside the bushing / then use the emery cloth to tune it ....but personally, I just toss them out ( they're cheap ) ...and you can pick up all kinds of bushings from Mec, your local dealers or your local gunshows.
( I hate the universal charge bars.../at least the ones produced for MEC ).
I just keep the standard bars in 3/4oz, 7/8 oz, 1 oz, 1 1/8 oz around ) ....pick those up at gunshows, etc as well...). The Universal charge bars come loose ..and they aggravate me...so I just keep it simple.