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Old April 27, 2011, 09:06 AM   #8
Brian Pfleuger
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Join Date: June 25, 2008
Location: Central, Southern NY, USA
Posts: 18,791
Barrel length is not a factor in peak pressure.
Are they using the same exact bullet, brass and primer?
Different brass has different powder capacity. Different bullets, even of the same weight, can be different length which can effect the remaining capacity inside the case.
Besides that, different lots of the same powder can vary by 10%.
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