It's a little weird, but no harm, no foul unless she finds out. Don't get used to lying about little things to your wife. Little things will turn into big things eventually.
Unless you have a group of guys you're planning on hunting with each year and getting away from the wife for a week or 10 days (I'm one of those guys), get her into Hunter Education and buy her a first firearm. She'll never forget it. If she's into it enough to go out with you when she has no chance of shooting, think how excited she'll be to actually hunt with you. And she won't get so "down" during the slow times, too. You have a hunting partner for life, something that many have searched for in vain. Don't squander it.