https://thecastlearms.com/product/fiocchi-616-shooting-dynamics-616-primer-12162028410-gauge-1000-box-5-case-1#product_detail

Fiocchi 616, 209 size, shotshell primers have a reputation for reliability and consistency for use with 10 Ga, 12 Ga, 16 Ga, 20 Ga, 28 Ga, and .410. These primers we sell as loading components are the very same ones we use in our United States factory of loading. Using our 140 years of experience our engineers have designed what we feel is the highest quality shotshell primer on the market, with special care taken in all aspects- mixture, battery cup and anvil.