A400 with 28g now cycles fine :)

[FreeZey]

I brought 4 boxes of 28g cartridges last week (all different manufactures) and every one went through fine

 

So it looks like the weight was the issue and the lack of breaking in that caused my jams. I now very happy with my beretta and appreciate the advice I received on here.

 

I found the ones I shot best with were Gamebore Black Gold. I was quite surprised how much difference in kickback there was too, the blue Eley First I tried felt like someone was hitting the end of the barrel with a lump hammer.