Interesting.
Try RWS Gecos. Cheaper than Hobbys and go well enough from my Rohms for just plinking. RWS R10 Match may be cheaper than H&N's. There is always Bisley Practice?
I found Superdomes very tight if I was using up a tin for the pistols.
I am using Hobbys in my Rohms at the moment and no problems there. Must be the Beretta mags?