Originally posted by sigfreund:
I wasn’t going to get into the grammatical aspects of the issue, but now that it’s been brought up, that is another thing.
“Soft” in the sense of a “soft shooter” is an adjective modifying “shooter” which in that expression is a gun, i.e., a noun. In that context therefore, what it implies is that the gun is soft, or to use a couple of synonyms, that’s it’s squishy or malleable, or perhaps flaccid (to return to one of my antonyms). That, of course, is not what people mean by the expression. What they’re referring to is how it shoots, not the “shooter.” That means the proper modifier would be an adverb in a phrase such as, “It shoots softly,” as you correctly pointed out and used—but which most people don’t.