For fun I shot two H&N Rabbit Mag II 25.31gr and two Crosman HP 14.3gr. Using the same tune as above I got 717fps on the H&N and 910fps on the Crosman.
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My HS adjustment only turns in 4.25 and not 5.5. I'm giving it a fair amount of torque. To be honest, I'm a bit apprehensive in turning it harder in fear I'll break something.
Update!! I replaced the magazines included with the rile with a couple of Benjamin Marauder magazines and the jamming has gone away entirely!
Thank you for the suggestion!