Great combo for mule deer. I would use a premium bullet and you should be in very good shape I used the 140 grain Hornady light magnum for my mule deer hunt last year and it also did the job nicely on a big buck. I chose it because my gun shoots 1/2" groups with it. If the new Hornady 130 grain interbond bullet had shot tight groups, I would have used it instead.
Unless you REALLY want a new gun, there is no reason to switch. Good luck on your trip.
txhunter58
venor, ergo sum (I hunt, therefore I am)