FBI wanted 10mm 180gr. @ 980fps only??

[ihatecars]

^ I can't think of any reason why the size of the gun would matter to the bad guy getting hit

 

[JTQ]

I'm pretty sure I read the whole thread, and I'm not sure what question you are really asking.

As mentioned by other posters, the 10MM round was around before the FBI decided to use it. They didn't need the full power available with 10MM, and initially a lower power 10MM round was developed for their needs. With the help of S&W and an ammo maker (Winchester?) they developed a round that gave them the lower level of performance in a shorter case that enabled them to put it in guns designed for 9MM sized rounds rather than larger guns designed for 10MM/.45ACP rounds. Hence the .40S&W which gave them the performance level they wanted, in a smaller gun, with larger capacity.

 

[joneb]

Double tap is more doable with a neutered 10mm, hence the 40 S&W.

 

[Mainsail]

From the research I did on the FBI and the 10mm, they chose the round due to its potential. It could be loaded hotter if the need arose, but it was considered effective at the lesser loading. Think- room for growth.

 

[ihatecars]

^ Living up to your username I see thanks for carrying my original curiosity to the next level! Makes so much more sense. Mmmm more reading more studying.