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While making a bunch of chamber casts with cerosafe I have found that most tubular magazine lever actions have a slightly oblong chamber to aid feeding. The Marlin .32-20 and .25-20 are notable for this. With them it shortens brass life.
When starting our newest project, a .30-30 Ackley Improved we noted this while reaming the chamber. The Model 94 had what we thought was a smooth chamber but the reamer proved otherwise by taking off metal on one side and not the other for quite awhile. Finaly we got down to where the reamer was bigger than the original case and it began to ream all the way around. This was only toward the base. It never did cut 360 degrees right at the base.
If you full length size your cases and measure the pressure ring, how much expansion do you get with your maximum loads?
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