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Old November 27, 2012, 09:54 AM   #8
Senior Member
Join Date: September 27, 2004
Posts: 4,811
As others have said its the variation in components & equipment that you're seeing. Sometimes it can be quite large.

My usual advice is to look a little deeper than just the load tables. There is usually some kind of preface or intro to the load. I look at this first & allopcate a priority from several manuals, giving preference for the closest match for components & equipment to what I'm actually loading.

AS an example I was working up some loads for a 6" revolver. One of the sources had highger velocities than any of the others, looking at the equipment used it had a 10" pressure barrel in a universal reciever. I ignored that data.
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