That will be the difference chap...just trying two guns is not scientific...did you measure the barrel diameter of the guns, did you measure the barrel length...did you check all the seals, did you measure the thickness of the lead deposits inside the barrels...did you measure and weigh all the pellets... what chrono did you use...did each pellet have the same clearance, were they all the same shape, what was the wind direction, etc, etc..it's called repeatable....not, my mate tried it in the garden!!
Chap...... that is the whole point NODOBY has done anything scientific here......I cann