Posted 22 October 2011 - 08:26 PM
The 10mm is the original 40. Long story short the FBI adopted the round (200grns at 1200fps). There was lots of trial and error, testing and what not. Tons of speculation that agents could not qualify with it due to recoil along with the frames of the guns were larger in size. They took powder out and developed 10mm Lite or 10mm FBI, 180grns at 950fps. Then they thought hey no need for these large cases after we took all that powder out, cases were shortened, put on 9mm framed guns and the .40S&W was born. The rest is histroy.That being said, the 10mm is the best service size handgun round in the world. It is a reloaders round though, the factory stuff is watered down and weak. It is merely .40+P and a waste of the consumers money. You can get anything form 135grn up through 230grn. It is the most versatile cartridge for handguns. 180 and 200 grains are the most popular. Swampfox and doubletap make legit 10mm ammo. A normal 10mm loading produces about 650 to 720 foot pounds of energy. It is probably the best hunting sidearm you can possibly think of, 200 grain cast bullets at 1250fps is pretty hard to beat for CA back country critters. A 40S&W is not even close, and dont ever let somebody talk you into believing they are; maybe the watered down factroy garbage is but not a true 10mm. Recoil out of my G20 is not that big of deal, they pop hard though and sound like stout 357 magnums. Everytime I go to the indoor range somebody comes down and aks what my Glock is chambered in. It is such a fantastic round. I reload it, shoot it and adore it. Go 10mm, its time for a comeback of this cartridge. I wish I would have bought my G20 the day I turned 21, thats how much I love the gun. I run a 22lb recoil spring in mine because the slide speed is just to fast with the stock one. It will throw brass 25 feet. I have about 1500 rounds through mine without a single failure/stoppage. Anymore questions about the 10mm, give me a PM. I have been reading everything I can get my eyes on about this round for a while.