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There are many reasons why this might happen. There might be a difference in diameter of as much as 0.0005 inch, which will affect pressure. The shape and bearing surface is probably different, which will certainly cause a change in pressure, and therefore velocity. Some solids are steel, but I don't think your's are. The seating depth inside the case is probably different, to get the same overall exterior length. And, I've probably left out some. |