I've no doubt the #3 and 1885 falling block rifles with crescent buttplates cited, in the chamberings cited, were pretty punishing from the bench. But again, those are either modern iterations of a vintage design (1885) or inspired by vintage designs (Ruger #3), where a crescent buttplate would look "at home."
The point in my earlier post being: there isn't exactly a trend among rifle manufacturers to equip current rifles with crescent buttplates per the OP's implication. Not only would they look totally out of place on modern rifle stock designs and be very impractical on a typical scoped hunting rifle, but they're more expensive to install and would drive up the price unnecessarily.
