JaoeyP
Silver $$ Contributor
If you bruised your collar bone, you are not holding the rifle in your shoulder properly.
Also agree that you should have a pad on the rifle butt. QED.
This was my first thought. When I first started shooting centerfire rifles I made this mistake a lot. Stick that butt in the meatiest part of your shoulder. Pads help but will not fix the problem if the rifle is tucked into your collar bone.