I called my little off the beaten trail Gun shop and had them set some small rifle primers aside for me. They had several different kinds but I asked for the CCI ones. When I received them yesterday I didn't pay much attention but today I went and looked and they are CCI number 400s which are the small Magnum rifle primers. What if any differences will I see by using the Magnum primers as opposed to the standard primers? If there is a difference what steps do I need to take in order to get the same results as far as accuracy and performance? I can take him back and switch them out but I'm wondering if it's worth it since it's a pretty good ways away. Any help you can give me would be greatly appreciated.