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This video details the steps I take to reload brass .410 Bore CBC shotshells imported by Magtech for use in my shotgun. Your firearm may be unable to fire this load safely as I worked this load up to fire in a 16 gauge shotgun with a .410 adapter. Please work up your own load for your own gun using published load data.
Case Selection
Long term reloading of .410 Bore shotshells means using all-brass hulls. Reloading brass shotshells requires more knowledge and skill, but they will last virtually forever if properly taken care of. Magtech sells new, unloaded 2.5” brass hulls. Vintage hulls may be found and used if they are in good condition.
Priming
When loading brass cases for use in the .410 Bore shotgun, pistol primers should be used. It all has to do with the pressure generated by the loads and the designed impact of the firing pin: pistol primers are designed to ignite with only six to nine pounds of impact, and resist pressures only half that of rifle primers.
Powder Charge, Shot Charge, and Wads
Card wads are needed over the powder and the shot column, and felt wads are needed over the powder wad. These wads can be cut from thick felt or solid cardstock using a homemade punch.
The card wads should be left "dry," but felt cushion wads should be lubricated to reduce leading in the barrel. There are nice commercial products available for this, or you can soak the felt wads in a 50-50 mix of melted beeswax and Vaseline, then let them cool and dry on paper.
Wad pressure is a controversial subject. Of more importance is seating resistance, where the top wad is sealed firmly enough to enhance pressure buildup before releasing. The old way, when all brass cases were the norm, was to put eight to ten drops of waterglass on the top wad. I prefer to use Elmer’s glue.
Obviously, the height of the load within an all brass case depends upon the thickness of the felt wads used, but the actual height does not matter much, really, as long as the top wad is securely sealed. This is a total departure from loading recommendations for plastic shotshell cases, but all brass hulls do not need internal support for stability of the top folding or roll crimp, as there is not one. As long as you weigh (or measure) the powder charge and shot charge, the thickness of the felt wads is not that critical. Of course you can experiment and add or subtract felt wads to reach the top of the case if you want too, just as it is possible to cut plastic strips (similar in thickness to gallon milk jugs or bleach bottles) to surround the shot column inside the case to reduce lead shot scrubbing against the barrel.