AEA 3D printed pellets in a sub 12fpe HP max

Because our laws restrict power to 12/6 fpe for rifles/pistols it means that 77grn .357 pellets go somewhere between 180-250fps. I 3d printed some pellets that then have a .22 pellet pushed into a recess in the front and these weigh about 19grn and travel at between 360-500fpe which is a vast improvement. Has anyone else tried this?

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Because our laws restrict power to 12/6 fpe for rifles/pistols it means that 77grn .357 pellets go somewhere between 180-250fps. I 3d printed some pellets that then have a .22 pellet pushed into a recess in the front and these weigh about 19grn and travel at between 360-500fpe which is a vast improvement. Has anyone else tried this?

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Kinda like gamo lethal, nice