Hatsan New to HATSAN products

So my wife just gave me a early Christmas present.. it's a hatsan Neutron Star 25cal. Has a ATN Xsight 4pro scope with ABL1500, has a cv life bipod, fx chrono v2, donnyfl sumo moderator, and ir950 light. It's a sweet set up...But they say this gun likes slugs. I've tried a bunch of them ranging from 28gr to 40gr...non of them were accurate on target. I'm dead 0@30yds with the JSB 33.49gr ex king heavy mki. with dime sized groups. But slugs? ALL OVER The place... Yet I see reviews saying it really likes them, but in a .22cal ...does anyone have any ideas for a 25cal. ? In this gun ...

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What's the difference between the JSB mkii and base series? Everywhere I look the mkii are sold out.
The MKll have a heavier filled skirt on the inside. If you compare the standard to the MKll you can see the difference. I am not sure, but I believe it adds to the stability. I have been using those for sometime and there are very consistent. At least in my rifles.
 
The MKll have a heavier filled skirt on the inside. If you compare the standard to the MKll you can see the difference. I am not sure, but I believe it adds to the stability. I have been using those for sometime and there are very consistent. At least in my rifles.
Iv been shooting the base version ex.king heavy. The rifle loves it. Just can't get my hands on the mkii yet.. hopefully soon ..