Taurus Judge...revolver chambered in .45 long colt and .410 shotshell. If your long gun is in your truck...it's not much help, and it's hardly practical to carry a shotgun around with you while you're working.
I have family in NH and they always carry the Judge loaded with some kind of shot (it escapes my memory) to handle snakes when they're out taking care of their land (250+ acres, 15 minutes from the nearest town). They have young children and even a non-poisonous snake, when stepped on, can/will still bite and injure a child. I love animals as much as the next guy, but if you're ever going to have children on your property...I won't lose sleep over dead snakes. If a poisonous snake bites a child or smaller adult in a rural area, might be too late by the time they get to the hospital.
The last time I was there, they had a Timber Rattlesnake skin curing...seeing that made me want to go home and get my shotgun to have with me!