It seems, with the current 'ammo shortage' there's an abundance of choice for shotgunners. At least, in my neck-of-the-woods.
(http://i165.photobucket.com/albums/u53/zephyr10_photo/The%20Ammo%20Locker/IMG_0240_zpsa99ed58c.jpg)
(http://i165.photobucket.com/albums/u53/zephyr10_photo/The%20Ammo%20Locker/IMG_0239_zpsb8693e45.jpg)
(http://i165.photobucket.com/albums/u53/zephyr10_photo/The%20Ammo%20Locker/IMG_0238_zpsa13dca57.jpg)
Plenty of 12-gauge OO Buckshot. There seems to be a lot of the mil-spec variety, in this case Olin manufacture.
(http://i165.photobucket.com/albums/u53/zephyr10_photo/The%20Ammo%20Locker/IMG_0242_zps39c9cb41.jpg)
(http://i165.photobucket.com/albums/u53/zephyr10_photo/The%20Ammo%20Locker/IMG_0235_zps14c1eb15.jpg)
(http://i165.photobucket.com/albums/u53/zephyr10_photo/The%20Ammo%20Locker/IMG_0232_zps2d6d71dd.jpg)
Along with lots of sluggers from Remington, and Brenneke.
Yes I have seen a few various loadings for the Shotguns, but I still invested in a buckshot mold to cast 00 and #4 buck shot just in case. Here are the 00 buck loaded over Blue Dot.
(http://i1086.photobucket.com/albums/j441/_The_Shadow/IMG_0901_zpse2b7a631.jpg)
10 00 pellet load
(http://i1086.photobucket.com/albums/j441/_The_Shadow/IMG_0902_zpse564b37c.jpg)
Duplex 00 & #4 buck
(http://i1086.photobucket.com/albums/j441/_The_Shadow/IMG_0903_zpsae0629dc.jpg)
I like your 'Duplex' loading. It's looks interesting, and must be a nice defense mix.
I still need to test them out, but they should provide good results!
BTW the Duplex Load consisted of 16 pellets total, 8 of #00 & 8 of #4 Buckshot.
I could get a 12 pellet load of 00 buck, 3x3x3x3 if I cut the petals off of the wad's shotcup.