JSB king heavy .25 MK2

.255
.255
.255
.256
.254
.257
.256
.256
.254
.256
Just for comparison purposes I measured 10 AirArms Diablolo Field 25.4gr pellets that I am currently shooting and like in my Vulcan. There is a difference. I have noticed that the MKII load a little harder in my Vulcan, so this might be why. Hope this helps. I also wanted to measure a different skirt just in case there was a variance in my calipers vs someone elses. Hope this helps with your question.