mobocracy said:
Quoting shamelessly from Speer #13 loading manual:
In 1974, the industry adopted the +P headstamp for cartridges having two pressure limits. Because the 38 Super is identical in appearance to the older 38 Auto cartridge, the +P designator was added to the Super case to avoid confusion....These loads are not for use in Colt Models 1900 and 1902 pistols.
In other words you're right -- 38 Super +P as a designation for a higher-than-normal power 38 Super doesn't really exist in the same way that 9mm +P or 38 Special +P does. Or I suppose you could think of 38 Super +P as being a 38 Auto +P load, although that's probably less formally correct.
...no, you hit it right on the money. The .38 Auto as originally loaded ran in the 1050-1150 range. When introduced in 1929 in the 1911 there really was no .38 Super ammo at first. Slowly the ammo companies raised the valocity till some were reaching 1300 fps...and most of it was not marked "Super"...just .38 Auto. I am not at home so I don't have my reference material avalable but it wasn't till many years later that there came to be some concerns that Super ammo was getting into 1902 Automatics. It didn't "blow them up"...just beat them to death to the point of a possible dangerous breakage.
If you notice there is no more .38 Auto ammo on the market...there is however a whole bunch of .38 Super 130 grain FMJ rounds that are going about the same velocity as the warmer original .38 ACP rounds...meaning...the .38 Super is nothing more that a .38 Auto in a mis-marked case...and the .38 Super +P...most of which doesn't even make the the 1250-1300 FPS velocity of the original 130 grain rounds...are nothing more than .38 Auto +P. The only "real" .38 Super +P rounds out there are by CorBon, MagSafe and maybe Georgia Arms. Truely sad....
As to using 9x23 or 9mm Largo in a Super...will depend on how your gun is chambered.... First your chamber has to be of the newer headspace on the casemouth type vs. the original headspace on the rim. Second it will depend how tight the chamber is.... I have a dozen Supers and almost all of them will feed and fire 9x23 and 9mm Largo like they were chambered for them...that includes the two MechTech Carbine Conversions I shoot also.
One thing that has happend to me lately is several cases of "Superface" that had only happened twice in the last 25 years of shooting the Super (and that was my fault for trying to push a Hornady 160 grain .357 bullet to 1200 fps). I had bought a whole bunch of brass cases at an estate sale and loaded them fairly warm but nothing my guns haven't been handling without any problem for 25 years...cases started blowing however...all turned out to be old .38 Auto cases. They have now all been sorted out and no more "blows" have occurred.
Nominal bullet dimeter for the .38 Super is .356. As it is a straight walled case this means that any .355, .356 or .357 diameter pistol bullet will work. I have used bullets as light as the 88 grain 9mm Speer HP to the 160 grain Hornady .357 Silhouette bullet and have seen loads from Layne Simpson using the 170 and 180 grain Sierra RN bullets...no other pistol cartridge has this versitility...
Tipoc...a 1949....Super...wow....I have two 51s, two 52s and a 56 but would love an unaltered 1949...in the original box of course...:rock:
Bob