full brass cased 12 gauge in a semi auto?

i have always wanted to try my hand at seeing if i can get some full solid brass cased shells of 12 gauge to feed reliably in a magazine fed semi auto shotgun- more precisely a AK (saiga 12)

First 9mm ammo Ive seen under 30 cents a round, Page 2

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ADCO Best Arms BA312-PG 12 Gauge Semi Auto Shotgun 20 Barrel 3 Chamber 5 Rounds Tactical Front Sight/Ghost Ring Rear Synthetic Pistol Grip Stock Matte Black [FC-733315100287] - Cheaper Than Dirt

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What case is this? wildcat off of a 5.56x45

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Winchester Limited Edition WWII Ammo 12 Ga 2-3/4 M19 Brass Hull 00