Just tried the Double Tap 140gr. .40cal Tac-XP. Box shows 1240fps from a 4" bbl. Web sites states, Expands to .83" and penetrates 13.75" in 10% gelatin. This round has by far the biggest hollow point I have ever seen, it's all copper and reports are that it performs very well against barriers. It functioned perfectly in my G23 and accuracy was very good, and it was suprisingly mild to shoot. I was also shooting some Win white box for practice and I have to say the Win actually felt hotter. I have fired a lot of double tap and corbon and this is not what I was expecting. Very impressive to get this kind of performance with so little recoil. Price is $50.00 for 50 rounds vs Corbon $35.00 for 20 rounds and you get a little more velocity from the DT's.