I just finished a run of suspension.
When I mixed it with oil, it shot through a 25g no problem.
But, then I had to stop my fina three days before I stopped the suspension because of the clomid timing. And, I could not shoot it worth a shit by itself through a 25g.
What else are you doing with it? You should mix an oil based AS with it. It will make your life easier.
But, if you shoot it by itself, 22g should be fine. Just don't point the needle downward. Keep it kinda "level" so the powder does not sink to the needle. And I always twist the pin while it's in so the powder does not settle. You will figure it out quick. It's just common sense.