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This has a muzzle velocity of 1312fps so shouldn't have any problem cycling your emperor 12ga semi automatic. Hope this helps.

Francis, Muzzle Velocity (fps) is 1312 and Muzzle Energy (ft lbs) is 1934. It is a medium power load and will cycle fine. B & P are more $ but are Muzzle Velocity of 1,550 FPS - https://www.budsgunshop.com/product_info.php/products_id/411560060/b&p+12+ga+traditional+slug+2-34+10rd