Very strange that Colt rated the earlier Detective Specials from the 1930s,for the 38/44 hi speed cartridge! All the catalogs list this(plus for the P.P. Spec. and O.P. and O.M.T.)This predecessor to the .357 magnum,sent a 158 gr. at nearly 1200 fps. Can't find too many +ps with those ballistics today! Either Colt was "wrong" or what? Should a steady diet be fired? Of course not,not good for the 21 oz. gun or your wrist(s) or for follow up shots. When the Cobra & Agent with alloy frames were introduced in the early 50's,they were NOT rated for the 38/44 hi speed.My 1932 D.S. (Square Butt) has fired hundreds of rounds of 158 gr lead hollow points with 5+ grs. of Unique, a load that falls into +P range,and has not developed any timing or wear problems. But then it was virtually unfired when I bought it in 1992,but finish wear from being a bureau drawer peace for 60 years! Bud