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first thing that came to mind is...
were they the same loads?
you can go from one mfr to another or from one to the same of the same load and grain and it WILL make a difference...
i load my own for consistency sake... and having tried maybe 15 different loads on my .270, .308 and 7 MM mag each as well as my hand guns, i've come down to rather precise config's... i stick with the same shells, powder batches, heads and primers...
just my thought
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