FJC,
Man, I'm impressed with the 25yd accuracy you're getting out of your P-3AT!! That in a 150rd group too!!! I can't wait to bench mine! Just kidding!
Good to see that you do shoot yours, so many buy a gun, load it, and carry it forever. In my initial tests three different types of ammo ran perfectly in mine. Mine were all HP ammo, which is what I carry. My take is, if it doesn't expand, it acts like a solid. No harm done there. I doubt if expansion is reliable with any I've tried. I'm gonna chrono mine when the weather improves and do some penetration tests as well.
Random Discharge,
Unlike the Secamp, NAA, and the Tomcat, the Kel Tecs are locked breach pistols. How much of a velocity difference between the blow backs and the locked breach with the same length barrels I don't know. I doubt if it is significant.
Will