What does a AEA Challenger .357 like to eat?

I ordered a AEA .357 Challenger big bore. What pellets does it like. I have some Hatsan Vortex Strike .35cal & was wondering if they are any good in this rifle. 

I,m do not care about slugs right off. I was hoping you guys could help me from buying pellets I won't use. I under stand JSB, work well but they are very pricey 

even though I will get some in time. For now I want to stay cheap until I get this gun down. Have any of you had luck with Hatsan Vortex Strike .35cal ?



Thanks Fly