![]() You also need to be aware of primer seating depth when reloading. Primer seating depth – how far the primer is inserted into the shell case – is carefully controlled in factory ammunition. Hodgdon reloading data meets this requirement. Just remember, in shotshell reloading the reload data must be specific to the type of shot being used. A coffee cup of tungsten shot is heavier than all the others.A coffee cup of bismuth shot weighs less than a coffee cup of lead shot.A coffee cup of steel shot weighs less than a coffee cup of bismuth shot.To try to simplify shot density, think of it this way: Shot density affects how much room in the shell case the shot charge will take up. This is the primary reason that lead shot reloading data can never be used with any other type of shot. The hardest shot types are steel and tungsten. Softer shot produces lower pressure harder shot raises chamber pressure dramatically. Shot hardness has a direct effect on chamber pressure. The two characteristics of shot that change reloading data are shot hardness and density. However, in loading shotgun shells, this assumption cannot be further from the truth. It is easy to assume that all shot types can be reloaded similarly after all, they look the same – being round balls of metal. This data was created in the Hodgdon Ballistics Laboratory under controlled conditions, and only the top two loads show pressures that stay within the SAAMI industry standard of All shotshell reload data on the Hodgdon website has been created using an average crimp depth of 0.055″.Īs an example, here are ballistic test results of a standard 7/8-oz, 12-gauge load when crimp depths are varied: ![]() A crimp that is too tight (too deep) can increase ballistics more than what is expected from the reload data. If your reload crimp is too loose (not enough crimp depth), it will hurt ballistic uniformity. An example of the correct crimp is what is found on factory loads. This is one adjustment on a shotshell loading machine that is easy to overlook. Crimp depth of a finished shotshell reload is an important dimension to monitor for consistent ballistics and safe loads.
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