Under the current regulations, Concealed Carry Permit holders are not allowed to possess any firearm, including a concealed firearm, when deer or turkey hunting unless the firearm carried is legal for taking the species being hunted. For example, an archery deer hunter would not be able to carry any firearm, whether concealed or not, when archery deer hunting. However, if a concealed carry permit holder is hunting deer during the legal “firearm” deer seasons, he/she may carry a concealed firearm, but only if that firearm is of the legal type for firearm deer hunting. It is not unlawful for a Concealed Carry Permit hunter to possess a concealed firearm in their vehicle. The specifications for legal deer hunting handguns can be found on page 17 of the 2013-2014 Illinois Digest of Hunting and Trapping Regulations at the following link; http://www.dnr.illinois.gov/hunting/Pages/HuntingTrappingDigests.aspx
https://dnr.illinois.gov/content/dam/soi/en/web/dnr/hunting/documents/concealedcarryqna.pdf