40 S&W 180 gr Speer Gold Dot loaded over 9.2 gr of AA#7 fired from a Kel-Tec Sub 2000 carbine and Glock model 22 pistol through four layers of denim into calibrated gelatin.
BB: 593.6 fps, 3.4"
Impact velocity: 1,081 fps
Retained weight: 179.7 gr
Max expansion: 0.741"
Min expansion: 0.492"
Impact velocity: 1,320 fps (approx.)
Retained weight: 178.9 gr
Max expansion: 0.781"
Min expansion: 0.538"
A few notes: The chronograph did not catch the impact velocity from the carbine shot so I took a four shot average. Velocities were:
I was surprised at how much velocity the bullet gained from the longer barrel and I was surprised to note that the faster bullet actually went deeper. I had to double check. The only explanation I can come up with is that the extra velocity pushed the petals back against the shank earlier.
Speer lists the factory velocity as 1,025 from a pistol so I believe that I got fairly close to what they put out but I do not know what powder they use so the burn rate could be substantially different. I did not have any extra factory ammo available for testing.