My first 10mm pick is the Glock 20 Gen 4. It's solid, reliable and shoots everything I feed it. After the Glock I decided to try a 1911 in 10mm and got a Kimber TLE II. What a disappointment! It is super fussy on what it will feed and whether or not it is going to eject the empty brass, plus getting the slide to lock back on empty mags is inconsistent. My G20 shoots everything. The Kimber is a temperamental beast at best, and the customer service was oxymoronic. For the price, a 1 year warranty is pretty underwhelming. Luckily I managed to obtain a Springfield TRP Operator which managed to prove that not all 1911's chambered for 10mm are the same marginally functional garbage. After the TRP I picked up a Sig Sauer Tacops in 10mm, plus after over a year of waiting, a Sig Sauer P220 Legion in 10mm. Every one of the 10mm's, except the Kimber, functions with all ammo types and has not given me any reason to mistrust them in competition. The Kimber I would not depend on. A few other models that I have considered include Remington Longslide Hunter 10mm with a 6" barrel, the Sig Sauer P220 SAO Hunter, an EAA Witness polymer frame, and finally, the new Springfield XDM 10mm. Good luck and hope this helps.