During the last decade or two we have seen the 45 gap, 357 sig, 5.7 x 28, 40SW, 10mm which have enjoyed limited popularity with some of them dying off (who has a 45gap these days?). Granted the 10mm still hangs on in the niche area of animal defense and hunting, the others have all either never gained significant popularity, or have lost significant popularity, everybody seems to go back to the 380, 38 special/357 mag, 9mm and 45ACP for CCW? Why do so many new handgun calibers fail to catch on?
IMHO the Ruger 57 will bring the 5.7X28 to new highs.
