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With the Glocks that would be a little hard to do. All the slides are thicker and wider on .45acp and 10mm rounds and the grip is still a little bigger even on the SF models. You could compare it to the 10mm, which I have but that is not the info you are looking for. Full house 10mm has more recoil then the .45acp+P but its still very manageable. When I load the slow 180 grain American Eagles my Glock 20 has less recoil then my fathers Glock 22 with 180 grain American Eagles. Even though the 10mm ammo runs a little faster it doesn't matter. The slide weighs so much more it soaks up the recoil better.

I see what you mean Heartland, I honestly don't know! Concealing an 18 barrel shotgun would be hard under a trench coat even. You would need something with a pistol grip and a barrel around 10inches. A LEO buddy has a short barrel tactical shotgun and I think the barrel is about 14 inches with a pistol grip and I still don't think he could conceal it easily. Here is an old thread on the CHL board to help you out but they pretty much came to the same conclusion you did. viewtopic.php?f=87&t=21816&start=15

Yep, your right! It would attract to much attention and the police would be called in almost all parts of the state and even if you could conceal a shotgun legally it would have to be much smaller then an 18inch barrel. I wouldn't mind carrying a short barrel 20 gauge during winter months under a jacket or coat but once again its not legal.

Well, I will agree that you can get a 9mm to go faster then a .40 but if you compare a 124 grain 9mm and a 155 grain .40 you will see that the sectional density of these two are very close and velocities are very similar. Of course I will whole heartily concede in the cost factor. 9mm is a lot nicer on the wallet when going to the range! What ever caliber round we choose all of the aforementioned are adequate for self defense with a pistol (if I could legally conceal a rifle I would)

Also, I really don't notice a huge difference in recoil from my sub compact s&W in 9mm with +P rounds then my .40S&W in my 27. This is why I never run +P in 9mm for carry(which I do very little of). At that point a figure I might as well carry my .40. Granted this could be just the differences in guns but they both are of similar size and weight and both have a 3.5 inch barrel. Carry what you are comfortable with is still the best advice.

It's the worst round ever because it is a neutered 10mm LOL! In all honesty I have owned all of these calibers and I agree that the recoil of the 9 and 45 are less snappy but my Glock 27 and 20 are the most accurate semi-autos I own. The other two semi autos are a Ruger and Smith in 9mm and neither is as accurate as my 27 or 20. Yes the recoil is snappier but my brother and I both shoot my 27 better then his Glock 17 within 10 yards. We assume this is because the gun is smaller and somehow balances better in our hands.

I can shoot a .40 S&W just as fast as my 9mms so rate of fire is no big deal. Of course after 100 rounds I can start to tell my hand is a little sore from the 27 but I can shoot a 9mm all day. In a defensive situation I would never get wrist or hand fatigue, unless maybe the zombie apocalypse comes.

Personally I prefer the .45 over the 9mm and .40 but if you practice enough I think recoil is not really a problem. Either way I would take a Glock 22, 21 or 20 for that matter over a 17. Sure the 9mm will work but when I can shoot just as fast and as accurate with practice why would I not carry the heavier, bigger, faster bullet?