Aren't .410 slugs the 'soft, squishy' foster-type slugs? They will not penetrate much bone/muscle. I once had a foster slug from a 20 gauge flatten on a shoulder of a youg doe without penetrating into the body cavity. Folks and agencies who recommend 12 gauge slugs for big bears also recommend the use of hard-cast slugs from makers like Brenneke. Saboted slugs in larger gauges work great on deer and such (certainly better that Fosters), but they are usually too lightly constructed for the big stuff. I would say a .410 slug might suffice for a coyote (maybe).
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