Shortly after I got done talking trash about .25acp in the other thread, I decided to go ahead and go out and do some testing myself since it wasn't raining yet. ammo from left to right: 22lr, .25acp, .32acp (with a .303-.32acp chamber adapter behind it), 9mm, 44mag, and a 500S&W with a 700gr bullet and the guns I took out today:FIE titan .25, Tec-dc9, jennings J22, S&W 629 5" Not pictured is a no.5 Enfield and a keltec .32 I didn't take the .500 with me, mainly because I don't have enough 2x4s sitting around to stop a .500. The first thing I did was chronograph all of them: Jennings .22lr with remington 36gr HP (golden bullet)=699fps, 39ft lbs keltec .32 with winchester 71gr fmj=788fps, 98ft lbs enfield with .32 adapter using winchester 71gr fmj=353fps, 20ft lbs (Yes, that's 353fps, not 1,353fps. Apparently this round doesn't have enough power to overcome the friction of a longer barrel or something, and actually loses velocity. I'm glad I didn't try these in the longer barreled enfield I had). Titan .25 with remington 50gr fmj=681fps, 52ft lbs tec-9 with winchester 115gr fmj=1,207fps, 372ft lbs .44mag with a 240gr nosler JHP (and 7.2gr red dot)=926fps, 457ft lbs (this is an incredibly light load too BTW) I was shocked by how slow the .22 was out of the pistol, and how poorly the .32 did out of the rifle, since I expected it to gain velocity, instead of losing over half of the velocity it had out of the keltec. Next up I tested penetration. The only thing I took with me to test penetration though was 4 2x4s, so the results from this isn't very exciting either. The .22lr went completely through 1 2x4 and was buried in the second, with the bottom of the bullet flush with the 2x4. The .25acp had almost exactly the same penetration as the .22, and was just a little ways into the second 2x4. .32acp from the keltec was stuck between the second and third 2x4, or basically twice as much penetration as the .22 or .25. .32 from the enfield made a dent about 3/8" deep on the front of the first 2x4. 9mm easily went through all 4 2x4s. I fired 4 rounds with the .44. Three of the rounds went through all 4 2x4s, but one of them was stuck about half way into the fourth one. Keep in mind that this load is closer to .44special than .44mag though. I'm fairly certain that full house loads will go through quite a bit of lumber. After all this, I didn't gain any respect for .25acp, but I lost some respect for .22lr, as I had once considered getting a S&W 317PD for backpacking. I still wouldn't volunteer to stand in front of any of these either though, but there is a pretty big difference between .25 and .32 as far as penetration goes (although 2x4s aren't exactly human flesh either). I didn't do any accuracy testing really, just some plinking at pop cans afterward. All 3 of the pocket pistols were reasonably accurate, and none had any malfunctions. The 629 is always accurate. The tec-9 was actually functioning well and hitting where I aimed it today too, which is a rarity. The enfield on the other hand, didn't do so good. It seemed to shoot way low, and after about 8 rounds through it today, I got a squib. This was actually the first squib I've had, but it was easy enough to dislodge with a cleaning rod after I got home. The whole novelty of the .303/.32acp chamber adapter has worn off now. 303british ammo isn't cheap to shoot, but I'm not real fond of paying $18 a box for .32 ammo to shoot in it when it's only going 350fps or getting stuck in the barrel. I also now know that if I ever get attacked by a 2x4, that even a .22lr junk gun will shoot through one...but not much more. All in all, I'm pretty happy with my two new junk guns.