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Since I got my new Zelos I've been obsessed with its tunability, particularly regulator pressure vs hammer spring tension. Thanks to the knowledge and experience of members here, I've learned a lot. After many test sessions with a chronometer and varied regulator pressure vs hammer spring...

Trying to tune my new Zelos, but the hammer spring adjustment has me confused. The regulator pressure is set to 2000 psi, and with the screw adjustment for the hammer spring turned all the way out, I'm gettin about 905 fps with 21 gr Barracudas. As I turn the screw in (clockwise) velocity goes...