H666: I'm not in law enforcement but I am a devoted fan of a 10mm bore. Notice I said 10mm bore, not necessarily the 40 Short and weak or the 10mm. I developed a bottle-necked 10mm cartridge based on the 45 ACP case in the late 70s. Cor-Bon hypes their 400 Cor-Bon as the first and only but their case chambers in my barrels whereas mine won't chamber in theirs.
I developed mine to shoot metallic silhouette and hunt big game. I developed mine to handle heavier loads than the Cor-Bon cartridge. I have had great success on the silhouette range and in the field. One of my favorite loads, that seemed to shoot very easily from my pistol was with a 180 grain cast semi-wadcutter (Keith style for the 38-40) at about 1200'/sec. If I wanted to loads that down to about 1100'/sec it woudl have made an excellent Police load, in the Elmer Keith mode, and I agree.
With the current 10mm loads, you are a bit underpowered for the cartridge's capability unless you find factory loads with 180 grain bullets to about 1200'/sec. Understand that for Police work those will penetrate the human torso through and through and create the hazard of overpenetration. In that regard the 40 S&W, carrying milder loads has better application for Police work, but only in that regard.
The 40 S&W is loaded to just about it's maximum capability to get 165s and 180s out at 1000 - 1100'/sec and you can't really push that cartridges pressure capabilities much further, as it's at about max pressure for the platforms it is shot from. The 10mm is bigger, longer and is fired from heftier platforms that will allow that cartridge to maximize it's potential in an autoloader.
I like the 10mm bore because it shoots a fatter bullet than the 9mm. The 9s can be loaded to velocity levels that will flatten their target with a single well placed hit. Unfortunately, too many Police agencies refuse to use 9mm loads to that capability, leaving their officers vulnerable. But, please also note that I said 'well placed hit'. In that regard, any cartridge of sufficient power will do the job when the bullet is placed right and in so many shooting failures that is more the culprit that the cartridge's capability. I used a 9mm in Vietnam for a while and it worked as well as any other ball ammo did - that is, you just kept shooting until your target went down. True, the 45 is a bigger bullet but fmj projectiles often penetrate without much target reaction. If you make a flatpoint, functional hollow-point or sufficiently penetrating soft point of them they fare much better. That's what I like about the bottle-neck design - you can shoot that stuff all day long without failure to feed, and the target reaction is much more noticeable.
I would like to see if that Glock can be throated to handle semi-wadcutter bullets of the Keith design - that would make it a capable load for whitetail out to 50 yds or so. Also, some of the other cast bullets for the 38-40, like the 170 grain round nose flat-point might also work well in that pistol.
I think ya dun good H. I like the 10s and think you will enjoy yours. You may wish to think about a set of heavier recoil springs from Wolfe - they would allow you to shoot those hotter loads and still have a wrist that will allow you to hold a cup of coffee without it looking like a tidal wave pool.
Just my 2 cents, free. This be Mikey.
