Well in summary, it looks like my gun (2013 Matador R3M .25 long) prefers the larger head diameter. This surprised me, testing the JSB MKII Heavies (Deep Skirt) or the similar Edgun 34g. The following results entailed (6) 5 shot groups @ 50 yds, of each specified head diameter. This testing was very comprehensive, as 1500 pellets were cleaned, inspected and sorted for weight and head diameter. Roll sorting was discontinued (for skirt diameter consistency), when it became evident that this was a waste of time, as they were all very consistent. Groups were shot alternating through each head size, to maximize a comparable environment...there was changing wind so comparative accuracy, rather than absolute accuracy, was the goal. Here's what I came up with:
6.37mm- .99" ctc
6.38mm- .96" ctc
6.39mm- .75" ctc
6.40mm- .63" ctc
6.41mm- .58" ctc
Unsorted- .76" ctc
Note that "unsorted" pellets came in, where expected and the accuracy trend lends itself to validate this test. Also noted was, the Edgun 34g were more consistent in head diameter averaging midrange diameter. My overall conclusion is that sorting helps a little bit but is probably not justified. I see more accuracy gains in finding the pellet lot that works best for my gun...in this case the old MKIIs with the shallow skirt. On a side note, I tried lubing some unsorted pellets, that had been cleaned and tested them against non-lubed, in no wind conditions. The accuracy gain was insignificant with results being .56 ctc vs .58 ctc, respectively. The big surprise was the gun seemed to digest the larger head diameter better than the smaller diameter...I would have expected the opposite. Here's an example of on card w/ the 5 head sizes represented:
6.37mm- .99" ctc
6.38mm- .96" ctc
6.39mm- .75" ctc
6.40mm- .63" ctc
6.41mm- .58" ctc
Unsorted- .76" ctc
Note that "unsorted" pellets came in, where expected and the accuracy trend lends itself to validate this test. Also noted was, the Edgun 34g were more consistent in head diameter averaging midrange diameter. My overall conclusion is that sorting helps a little bit but is probably not justified. I see more accuracy gains in finding the pellet lot that works best for my gun...in this case the old MKIIs with the shallow skirt. On a side note, I tried lubing some unsorted pellets, that had been cleaned and tested them against non-lubed, in no wind conditions. The accuracy gain was insignificant with results being .56 ctc vs .58 ctc, respectively. The big surprise was the gun seemed to digest the larger head diameter better than the smaller diameter...I would have expected the opposite. Here's an example of on card w/ the 5 head sizes represented:
