mmmmm interesting. All of my .177 rifles have been .5 ft.lb higher with heavies than with AA Diabolo Fields. In fact I set my power levels to 11.7 ish with heavies knowing that others will be lower. I also used to check power at 130 bar as this is the point at which my rifles produced he highest power levels.
When comparing pellets output I used to alternate with 5 of each in the magazine. That way it eliminates the effect of a power curve. I used a spreadsheet to calculate actual power values.
Glad you're sorted though.
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