Many years ago when IPSC shooters started using the .38 Super and were making major caliber with it, they thought that using SRP's in their super rounds gave hotter ignition of the powder and would help make major caliber ranking. That's more of a myth than fact, but it caught on and so lots of top competitive IPSC people did that. This was in the late 70's and very early 80's. Having the .38 Super make major caliber allowed the top competitive shooters to have a gun that gave less recoil than a .45 for faster shot to shot recovery during a stage.
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