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Tuning Something I should have recognized.

Retuning my Impact MK2, raised the regulator pressure to 110bar to see if the gun shoots 18.13Gr pellets better at 110 or 72bar. I was tuning using H&N Baracuda 18.13 to 875fps PW 2, trimmer 2 1/2. I then shot JSB 18.13 JBH. I had to turn the PW to 5 to get 870fps. JSB no longer lists the diameter of the pellets on the tins, but H&N list there Baracuda is 5.52mm. I wonder if the difference in speed is due to diameter, lube v lack of lube or ?.

Like the title says I should have recognized the differences in target hit points and didn’t.