Be careful about your choice of ammo in .308 Win
It sounded like from your email that you are new to Deer hunting. Your .308 Win is a great cartridge and is perfect for Deer. Two things that you have to be careful of.
1. The most important thing is to be sure to not use Military style FMJ (full metal jacket) loadings. These are sold everywhere for the .308 Win and are only good for target practice at the range and for pests like Coyotes.
Use non hollow point pointed soft point expanding bullet ammo.
2. Verify by checking your States DNR regs about magazine capacity limits for a semi-auto used in Deer hunting. Some States require a semi-auto only use 5 round magazines. There are places to look for the hunting magazines like gunbroker.com, cabellas, and gander mountain.