In years gone by I played with the older 2400 loads. 2400 seems too slow burning for .38 Special except when wound tight. It can give good, accurate results in .38 Special, though even the max loads seem sooty when fired and leave a lot of half-burned crumblies in the bore and on the cylinder face. Anything less than those old max loads gave large velocity variations and unsatisfactory performance.
I wouldn't bother with today's listed 2400 loads.
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