So...your comment about the FBI not being able to handle 10mm?
It’s utterly, completely apocryphal.
First off, the FBI never, not for a single second, considered what was considered the full power 10mm load (the 200gr Norma @ an advertised 1300fps). The wanted a load that would duplicate a 185gr .45acp load (what they considered the most effective autoloader round at the time). So...a 180gr bullet @ 950fps (.40 fans should recognize those numbers). Federal developed a 10mm HydraShok load with those specs; S&W delivered the 1076. It was found that a couple (literally, single digits) of agents with smaller hands had trouble qualifying with the 1076–due to the trigger reach. The S&W 1086, with a slightly shorter trigger, worked fine.
S&W looked at those specs, asked Olin-Winchester if they could duplicate it in a shorter case that would fit existing doublestack 9mm frames...O-W said they had already developed it in the early 1980’s, but didn't think it was commercially viable at the time. S&W said to produce it, we'll make the guns to fit...the rest is history.
This comes, mostly, from a (now former) agent who was actually at Quantico at the time as a trainer.