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- Most manufacturers punch the primer pocket into cartridge case head.
- Therefore all cases do not have equally deep primer pockets, and the bottom usually has a radius. This causes the primers to be seated unevenly and to different depths.
- It could cause some primers to protrude from the rear of the case, which is dangerous because it could cause a slam fire
- Primers should be seated to 4 Thou, or 0.1mm, below the surface of the case head.
- For safety and uniform ignition it is strongly advised that the primer pockets be cut to the same depth.
- This is done with the MAMBA primer pocket uniformer.
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