I have a couple of JW15's and got to try a few different kinds of ammo through them. To be honest I think my shooting is a bigger factor than the particular ammo at the moment. I only had a 42m range and could get 5rnd groups to less around 20mm, most groups had a flyer from me pulling it (I think the trigger is the big downfall of my JW)
From what I could tell the CCI 40gr subs and the Killwell (Whinchester) subs grouped pretty much the same, although the 5th rnd of the Killwell wouldnt feed properly out of my magazine.
I also tried Power Point and Whinchester HV, I gave up on the power point as every second on would fail to extract, the HV seemed to group as well or maybe better than the subs (didnt get to fire as many with the kids in bed though)
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