mini 14

[interceptor]

Mini 14 mags should work, as the donor/parent case of the .300 Fireball is a .223. I wouldn't think that the rimmed 7.62x39 mags for the mini 30 would function very well.

From listening to others who utilise the mini 14, if you don't already, I'd recomend the original Ruger 20 rounders. From what I hear they seem to feed/function better than any aftermarket ones.