# SAAMI Primers and Primer Pockets  # Chart Format  ### By Manufacturer  The **External** Dimensions of SP are all essentially the same. Therefore - these dimensions are not a viable measurement in which to sort. The External Height of rifle primers can be used to sort but primer reloaders must take into account the flattening process ("de-dimpling") of the primer cup bottom is imprecise and the "rounding"/dome of the primer cup bottom may have been altered as well. This can occur both in the de-capping step and/or "de-dimpling" process. One Method: ### [De-dimple by Tom Allgaier](https://rumble.com/vgtoxv-homemade-primers-dimple-removal-with-tom-allgaier.html)