I sent this email to a friend of mine several days ago. It should give you some indication as to the kind of enthusiasm the 10mm inspires.
"The firepower, penetration, and hard-hitting potential of a 10mm MP5 is greater than a .45 ACP Thompson submachine gun. At any range, the projectile fired from a 10mm MP5 has nearly twice the energy of a comparable 9mm, .40 S&W, or .45 ACP cartridge. "
I took this statment from the Heckler & Koch webpage. One of the most objective I can find now-a-days about the 10MM cartridge(my favorite). How the American shooting public was duped into believing "the 10MM is not a excellent cartridge" is beyond me. It has better ballistics than the 357 magnum. In fact, in the late 80s (early 90s) the 10MM was noted as demonstrating low end 41 magnum ballistics.
Of course we could not have began to experiment on the 10MM with a worst choice of cartridges, the NORMA 200 grain Truncated medal jacket. I was in Germany when the Delta Elite (that's another story) came out and bought the first one that hit our Rod & Gun Club. It didn't take long before the Norma ammo had left a bad taste in most shooters mouths. Not that the bullet weight was totally wrong but apparently little research went into the development of the NORMA 10MM 200 grain ammo. Recoil was much too excessive and everone was lead to believe that this was the nature of the 10MM ( I dissagree with that premise).
To make matters worst, COLT put a "PLASTIC" recoil spring guide in the "DELTA ELITE" (what were they thinking?) which the NORMA ammo beat to death at about 100 rounds. This made some people think the gun was no good, I just thought it was flawed. I took it to a German Gunsmith and had him mill a duplicate recoil spring guide out of 416 hardened steel (I kept the 2 spring configuration), tighten the slide/frame fit on a diamond press, and adjust the trigger pull to 4 lbs. The NORMA ammo was so expensive, I was forced to take up reloading. I used SPEER 190 grain truncated medal jacket bullets with 6.7 grains of Herc "UNIQUIE" gunpowder. What a sweet combination!! Try it sometimes if you're fortunate enough to still own a 10MM handgun.
Now I know what you're going to say, "Charles, you just reinvented the 45 cartridge..." WRONG ANSWER! The nature of the 10MM is much different from the 45. The report is sweeter and much more toleratble, the recoil is more controllabe, and l consistantly experienced greater accuracy with much less effort( that is, concentrating on stance, sight alignment, breathing, trigger pull to get off a perfect shot every time).
Today, my "DELTA ELITE" has been modified to perfection (for me). The list includes: WILSON's full length recoil spring guide w/ 2 spring configuration and shock buff, flat mainspring housing, combat hammer, Walnut presentation grips; KING's extended slide safety, extended slide stop and model 104 (I believe) grip safety; original barrel (crowned), trigger( adjusted to 4 lbs and sights (never touched). I would "checker" the front strap but the gun feels perfect in my hand as it is. I can put a smiley face under the 10 on a pistol target at 25 yards any day. Although I seldom shoot this weapon. It has become more of a trophy that flies in the face of conventional wisdom to me than an everyday carry gun (I possess a North Carolina "Concealed Carry Permit" ).
Although I do carry it when I'm feeling real special. On those occasions it is accompanied by only the best accessories, i.e. a "Galco Concealable" holster cut for a "Colt Officer's Model" (I like the look of that inch or so of steel sticking out the bottom of the holster); Wilson 9 rd 10MM magazines stuffed with COR@BON 150 grain 10MM JHP(1250 fps with a muzzle energy of around 620 ft/lbs). About the COR@BON 150 grain 10MM JHP ammo. I believe this is some of the most effective conventional ammunition available to the shooting public.
If Heckler & Koch would fit the "USP COMPACT .45" platform for the 10MM cartridge, I would be in shooter's heaven!! The Glock 29 just doesn't do it for me. I believe it would revive interest in the 10MM and do a lot to increase sales of gunbook magazines *_*