On three different days over the last week, I shot one 10 shot group each of the .25 JSB King Heavy and King Heavy MKII pellets, in an attempt to ascertain whether one performs better than the other, in my Air Arms S510. The wind and temperature conditions were significantly different over the three days, with the first day (top) having almost no wind, the second day and third day having about a 10 mph cross wind from the left, with a few light gusts beyond that.
I hand weighed a sufficient number of pellets from both tins, to a weight range of 33.90 to 34.00. The results are shown in the photo below. I don't know what the actual difference is in the pellets, but if this brief exercise was a true indicator, my rifle certainly favors the MKII pellets.
I hand weighed a sufficient number of pellets from both tins, to a weight range of 33.90 to 34.00. The results are shown in the photo below. I don't know what the actual difference is in the pellets, but if this brief exercise was a true indicator, my rifle certainly favors the MKII pellets.