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Old January 26, 2012, 07:05 PM   #10
hoffbill
Senior Member
 
Join Date: February 15, 2009
Location: Texas
Posts: 240
Are you loading like 5 Fed and 5 Win with the same load to compare? If you mix the two different brass in the same load and shot group the outcome may not be reliable because different brands of brass or even same brand from different lots can vary in capacity which can result in different chamber pressure, thus different velocity and variations in barrel and bullet performance.

I sort my brass of the same type onto lots by weight, try to stay + or - .5 grains or less in a lot. Not sure how much difference the weight of the brass needs to get before it makes a difference but I bet somebody on her does
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