Red giant super comp5/3/2023 ![]() Most actual cases have a rim diameter of 0.400 to 0.402 inch, and a case wall of 0.380 inch. 38 Super as 0.406 inch compared to the case wall diameter of 0.384 inch. Industry specifications (Sporting Arms and Ammunition Manufacturer’s Institute, SAAMI) list the rim diameter on the. This makes the semi-rim obsolete and unnecessary for modern pistols, but there are still plenty of old Colts around that benefit from the small rim-when it works. 38 Super barrels to headspace on the case mouth, and probably all barrels today do this. 38 Super accuracy improved.Įventually, manufacturers started to cut the chamber of. John Rollins and Richard Shockley identified the problem and sleeved the barrel chamber so the cartridge headspaced off the case mouth, which they described in an article in the June 1961 issue of American Rifleman. The cartridge is farther from the slide face and when fired, this larger distance can result in an inconsistent position of the brass and accuracy can suffer. Sometimes the small rim doesn’t catch the cutout in the barrel, and the cartridge slips a little farther in the chamber and is stopped by the extractor. Eventually, he dropped the semi-rim design and headspaced the rounds on the case mouth, such as the. Browning designed a few other rounds with semi-rims.
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