The one and only .410-bore hang-tag that has come to light 235582 shows "Use 2 1/2-inch shells" and that it was targeted with the 3/8-ounce load. When talking history of the .410-bore, keep in mind that from its introduction the 2-inch shell carried a 3/10-ounce load and the 2 1/2-inch shell a 3/8-ounce load. The 1/2-ounce load in the 2 1/2-inch shell that we all know didn't come along until about 1936.
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