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Notice the brass hull, with 2-thickness carboard liner. I think I'd simply be matching weight and adjust for regulation by load. A hollow base with thick walls, or hollow point might be necessary to lighten a solid lead projectile while maintaining some length.

I wouldn't put the wieght of the pictured slug at much over 300gr. total weight.

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There 425 grain projectiles.

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20 bore = 425 grains

pictured is a 12 bore cartridge
Super Magnum and standard Explora = 730 grains

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