From 72 till last year it was a Dan Wesson with a 6 inch barrel, I bought a new Ruger Black Hawk 45 Colt for this year, I dropped down to a 4 5/8 barrel, I took two deer with the Dan Wesson, both were under 40 yard, I figure the colt will give me a little more reach.
From your post it appears you are getting a "backup" to carry along with your rifle and won't be using it as the primary hunting gun? If so, my preference is something smaller for easier carry, but with some punch and more for close range if needed. There are lots of good ones, but my favorite is a Ruger SP101 in .357 with a 3" barrel, after market Pachmayer compac grips and loaded with Remington 158 grain (or heavier) jacketed soft point hunting loads. These are fairly priced, heavy duty and a nice leather holster is available from Ruger. The only drawback is there are no adjustable sights, but with some practice it isn't a real issue.