If you believe you started the wrong way or have developed a flinch then start over and do it right. Go to a range with a brick of .22 and shoot, shoot and shoot some more. Go through the same procedures as if you were firing a larger cal. gun and concentrate on firing the .22. Do not fire a larger cal. gun at this time. Return to the range and repeat again. The next time at the range start with the .22 again and after awhile of shooting start with your hunting rifle again. It takes some time but you can get rid of the flinch if you concentrate on what you are doing. Give it a try, I'm sure that it will help.