One curious feature of low-carb beers is that with the exception of non-alcoholic options, they’re all roughly 4 percent ABV—and never less than that. It’s a product of beer shopping psychology.

Schlafly Beer is stepping into the low-ABV beer space with Shorty’s Small IPA, a 3.0 percent ABV beer that’s now available on tap at all four Schlafly brewpubs. The beer is part of a new project to ...