... by the way I sorted all the damaged pellets out and sorted them out also by weight, prior to the grouping test. The shooting range was indoors and I am an experienced long range shooter.
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"Drumsnguns"Ernest I'm not sure how this plenum tube operates but it is interesting that you are getting such a large increase in velocity. Is it just a larger reservoir of air we are talking about?
Mine gets 860 fps maxed with 34gn Heavies. Other guys are getting much higher. like 880-895 I'm thinking that my probe is not lined up properly with the air transfer port.