Here in UK when Co2 went off ticket and we got Crosman imports freely , the 357 was sold with the original old style 6 shot wheel ....it wasn't long before the higher cap wheel was introduced . I was looking on YouTube some few years ago and one chap claimed his own early 357 could take both types of wheel whereas his other half's could only accept one mag .

As Jassi has said - this is for all its flaws not a bb pistol ....the rifled barrel is great and designed for pellets ....If you just happen to come by some cheap tins of Gamo / H+N lead ball then .....but otherwise stick to pellets