cricket .25 cal using polymags

They won't fit in the mag unless it's the shorts which I never found accurate in anything I tried them in.

You could use regular polymags by hand loading without the mag. I tried once and the results were not as good as with JSB or H&N pellets but they are ok for short range hunting. I judged them to be not worth the effort. 

Every gun is different so the only way to know for sure is give it a try. I find H&N hunter extremes to be every bit as lethal as the polymags but with greater accuracy in mine. 

In fact, a man owes it to himself to try a broad range of pellets before deciding which is the go to ammo in every gun he owns.