Hatsan How hard would it be to convert my .25 Hatsan Bullmaster to .30?

Seeing as how it's nearly impossible to get the Blitz BP in .30 in the US, I was thinking of converting my bullaster. I really want the extra power of a >30 more than I want the full auto, semi is fine with me. Would it take more than just getting a .30 barrel? There can't be that much difference in the bolt hardware and getting a .30 Hatsan barrel shouldn't be a huge issue. What do you all think, worth it or not?