The Glock 20 would be my choice for your application, over the other available 10mm pistols available. While I like the 1911 platform pistols in 10mm, for open carry in a good holster the Glock carries just as easy as any of them. With regular mags you have 16 rds of 10mm ready to go vs. 8-9 in the 1911 platform. The virtually indestructible (Under field conditions) platform and Glock reliability make a heck of field gun. And don't let anyone tell you that Glocks can't be accurate. Mine, and those I've used over the years have been at the very least, acceptably accurate. Some exceptionally accurate. Six inch hunting barrels, good adjustable sights, and all sorts of goodies are available at reasonable prices. Another good option would be the mdl 21 with the .460 Rowland conversion. You won't be under gunned with either one.
Savage