I've only been using the 223 for a short time; and only on goats. But I'm using the Buffalo ammo with the 55gr GameKings. The last big billy I shot was at about 100m range. It was a shaggy beast but the bullet exited without too much of a hole so is obviously pretty hard (killed it on the spot though). It didn't ruin a great deal of meat and could pretty much use it up to the hole. Seeing that it didn't expand a hell of a lot on a big goat with a thick coat of hair; I'd say it would give good penetration on a bigger animal.
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