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Message: <blockquote data-quote="magna19" data-source="post: 3051441" data-attributes="member: 24646">I could see some powders getting affected by the different primers in the 45.So you cant measure the difference at 20 ft. but at 100 yds. you get 2 ft groups with some headstamps and 15 ft groups with other headstamps. I would say that is reloader, shooter, measurement error. Why would you give advice not to worry about 50 fps velocity difference read in an article about the 2 different primer sizes in the 45 and turn around and give advice that headstamps cause you to shoot 15 ft groups and other headstamps only 2 ft groups but no difference at 20 ft.</blockquote>