10 mm and 40 cal is the same bullet. longer casing. more powder. In my opinion the 10mm is a good round but is still somewhat of an "exotic" if you don't load your own, when you can find it, it is kinda expensive. from what i've heard that .357 sig is a very good round.

just to clarify the 10mm has a longer casing.

The.40 and the 10 are the same dia.bullet.The 10 has a bit longer brass .Just think of it like the .40 is a .38 special and the 10 ia a .357 maxium(sp).I can get some 10 mm loads from Double Tap that are suposed to be running 1608 fps.But that is with a 135 grain projectile.

I wouldn't use a .40 to hunt hogs. We shot a wounded one 4 times to put it down with a .40 before we could kill it. Head on I've seen the bullets glance off their skull.

Kemster the 10MM isn't really an exotic per se it's just not as popular since the FBI has dropped the round from their service pistols. It was a bit more recoil than some of their agents could handle and the recoil was a bit to much for the S&W and 1911 frames of the day. The 1911 frame problem was corrected but not until the FBI and S&W develop the .40S&W. All they did was shorten the 10MM a bit much like the 38 and 357 or 380 and 9mm. I have both the 10MM and the .40S&W and I wouldn't even consider hunting with the .40. Not when I have the 10MM that can push a 200gr cast bullet @ over 1200fps for some serious penetration. But if I were to pick a handgun to hunt large feral pigs it would be a heavy 300 or 335gr bullet out of a .45LC or a 400gr out of 480 Ruger.
The .40S&W in my opinnion might work on small hog but if you can use something better I would suggest doing that.

I saw a video on YT of a guy shooting a hog in the head w/ a 44mag and you see the bullets hit but no holes or blood ,then he walks up to it and a flatten bullet is laying on the ground beside the hogs head, so I believe that the 40s bounced off w/ out a doubt, incredible as it sounds.

its a good side arm. as well as the .357 we also take it when we run dogs