I suspect this comes under the heading of old news, but it might be misleading to consider these guns made for .38 Specials. Yes, that was the chambering; but the load was some different. The Heavy Duty and Outdoorsman models were produced explicitly for use with the 38/44 S&W Special. The garden variety .38 Special of the day produced a muzzle velocity of 960 fps (from an 8 3/4" barrel). The 38/44 S&W Special from the same barrel length came out at 1,226 fps. By comparison, the 357 Magnum which came along a little later was at 1,512 fps. All this data from a S&W catalog of the time.
Ralph Tremaine