I've been wanting another stainless 1911 10mm to IWB for a few years; I have 3 already, but they're just too nice to carry. I've looked at all the nicer stainless, 10mm's on the market, but they're all over $1200, and I don't want to spend that kind of money for more power. So I said, "SCREW THIS" and converted my Kimber TLE/RL stainless .45 acp to .45 SUPER, which gives the same ballistics as the 10mm; using Underwood .45 Super, 185 gr XTP/JHP's I get 1300/700 power, which matches 10mm 185 gr rounds AND I only needed to add $28 worth of parts to my pistol. Parts - 1. 22# recoil spring & extra power firing pin spring $7 2. 25# mainspring $6 3. Flat firing pin stop plate $15 AND for added dependability I use higher power magazine springs, which increase function/reliability; especially using the 8 round followers in my magazines. ALSO, to fire "lesser" .45 acp rounds I just need to easily switch to a 18.5 recoil spring. This setup in my TLE/RL fires like "butter" and (by the way) you do NOT need a "fully supported/ramped barrel", like so many of those with no real knowledge tell you online. The .45 Super cases are plenty strong, and there is no "bulging" of the case. Now if you wanted to go even hotter than the factory rounds, it would be a good idea to go with a ramped barrel. Underwood makes the best "higher power" rounds, (in my opinion), in several calibers, and charge HALF of "others" ammo. The nickel cases, cannelure/swagged bullets and smokeless/low flash powders are great. I also happen to think the XTP bullet is the best all around available today, and they feed real smooth. I really like like the features on The Kimber TLE, and with a little throat and ramp polish they are as reliable as the best.