thinking on my 2cd air rifle Hatsan 135QE Vortex in .30

I am interested to hear the comments about the 135 .30 I have considered it but withe the expense do .30 pellets I sure would like to be able to shoot round balls out of it since it's a rather short range rifle any way.

Has any one given that a try ? Like the idea of casting the round balls myself. Looks like it would make a neet short range hammer.