My experience with the Sierra boat-tails is that they seem to have a thinner jacket--at least the 150- and 165-grain.
The priority is less the bullet weight, on a hog. I think that construction of the bullet is more important, for deep penetration through thick hide and heavy bones (compared to deer).
IMO, your Grand Slam load, mild load that it is, would be both pleasant to shoot yet quite capable of adequate penetration.
FWIW, Art
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