I don't own a "Delta", but I do own a "Recon", which basically has the same power-plant. I tuned my Recon shortly after it was purchased, when first chrono'd it was shooting 460 w/ Remington point's(7.9gr), after a good lube-tune, and a spring change, it's now shooting those Remington point's at 550fps, and 750fps with Skenco type 1's(5.7gr), and 740fps w/ Daisy Lead Free field point's(5.2gr), and roughly the same m/v with Gamo Raptor's(5.1gr)although accuracy is no-where near what you receive with either the Daisie's, or the Skenco's,I also wanted to add that Skenco type 4's(6.4gr)really shine in this gun, excellent groupings well past 30yds. Hope this help's, Cheer's, Andy.
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