Whelennut: I have been dealing with Prairie Dogs and Rattlesnakes for 50+ years now.
I prefer to carry my Smith & Wesson Model 651 in 22 Magnum - loaded with bird shot!
Here's a tip for you - if you Hunt near or from your vehicle then drive around in a small circle once or twice as you are parking. This gets the snakes "moving".
Then don't "leave" your hearing protection on while YOU are walking around!
This allows you to hear Rattlesnakes better.
Rattlesnakes rarely come toward my Prairie Dog set-up spots due to the commotion (vibrations?) humans make -so make some noise as you set up (stomp around) and try to set up in shorter grass areas.
Take it from one who HAS been bitten by a Rattler you DON'T want to be bitten by a Rattler!
August is a top month for Rattlesnake bites (I was bitten on August 22nd seven years ago) so be cautious and stomp a bit.
Enjoy your Hunt and let us know how you do.
Hold into the wind
VarmintGuy