Good day for the farmer

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Shot a pile of them today on a new farm ! 
 
Fx impact 25 cal 700mm barrel slugliner shooting 33.95 jsb mk2 at 909 FPS out to 75 yards! Some were shot with the gun set to minimum power shooting the same pellets at 630 FPS inside one of the barns


How does dropping the power effect accuracy? Were you close enough that it didn't really matter or perhaps you already knew the amount of pellet drop to expect?