How about buying a couple of 5 round mags for hunting and keeping an empty one in the rifle and a loaded one in the glove compartment or to be ultra cautious elsewhere in the vehicle (bed of pickup, camper shell, whatever). You can't shoot while you are driving but they are readily available via glove box of back of truck. I have 30, 20, 10 and 5 round Magpul magazines and the 5 round ones are great for range use from a benchrest. Once you stop the vehicle and start hunting, either use the 5 round mag or switch it out for the 30 rounder.