AirMaks Arms Krait compact energy?

I was hot on buying one and shot one a couple weeks ago as well. The shop had it shooting JSB 18.13 at 910 fps or just a shade over 33 FPE.
Have to admit that I was impressed with the ability of that short barrel to produce that energy. It shot better at 880 fps after we backed the hammer spring off.
It did. But the groups spread a bit. And it was loud. I'm shooting them at about 895-900 now.
I’m thinking it should push a .25cal right around 40 FPE
 
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