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Not sure I understand the comment about loading. It doesn’t matter if it’s progressive or uniform depth rifling, the bore size is constant and the properly fitted Minie bullet will load the same with each. There may be some advantage in fouling control with the progressive depth rifling, which gets shallower towards the muzzle.
David
This old post does a good job summing up what I believe is the main advantage of Progressive Depth rifling.
https://www.gunboards.com/threads/progressive-depth-rifling-what-it-is.373743/