.177 20gr Zan

Anyone have good luck shooting these out of their FX's? This is my first time shooting them out of my mkii impact with a 600mm barrel and I am not mad at these results. This is from 34 yards away. 6 shots with a flier.

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They shoot well from my Panthera 600 177, but I’m at 5000ft which means less twist needed to stabilize. At sea level, the 1:18 twist of the FX liners is not expected to provide enough spin.
I found another one of my air rifles actually likes these, it is an 8 year old AT44 PA style. I can hold better groups than the impact did that the time. It shoots the 15grnsa at 923fps so I assume the 20gr zans must be going about 800-820fps.
 
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