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Message: <blockquote data-quote="swampratt" data-source="post: 3051333" data-attributes="member: 15054">Back from the 2012 era.I shot same load through my chrony F1 in 45acp and only difference was small primer vs large primer.They both shot within a few fps of each other But the small primer had less over all spread between first to last one shot.Group size was the same.I did not measure neck ID and case weight and I did not trim.. there was NO crimp on any of them.I suppose if I fully prepped cases like rifle cases and sorted I may see different results.I used 4.0gr bullseye and 200gr lead swc.I have tested different primers in .223 and with a certain  powder there was 100fps difference.!!Change to a different powder and retest and no difference.Some powders just act different.So i would not put too much thought into 50fps loss as it may not happen depending on powder used.I do sort by headstamp in my pistols as the different brands definately shoot different.15 foot group at 100 yards with some brands and 2 foot groups with others. same load used shot same day.shoot at 20 feet and no difference can be measured.</blockquote>