I have 1/2" and 5/8" powder slides and housings for both. I also have spacers to convert 00 housings to handle 1/2" or 5/8" powder slides.
Both the 1/2" and 5/8" powder slides accept bushings which I make. 22 grains of 2400 is a bit much for even a 5/8" bushing slide. It requires a bushing with a hole size of .450". Since I'm working with 1/2" stock, that's more of a sleeve than a bushing, but still possible.
A 1/2" bushing slide with no bushing (i.e. a hole size of 0.501") will get you to 21.75 grains of 2400. If necessary, you could enlarge it slightly to get to 22 grains.
Bruce Williams