You say Speer told you that, Really??

Well, when Speer developed that round for the NYPD they told them they could also use the same load for the few officers who still carried a 4" service revolver.

To prove my point further, the sane exact bullet is used in Speer SB .357 Magnum load which is rated @130 fps more then the .38 Special load. I highly doubt the slightly longer barrel will generate more than an additional 130 fps with the .38 Special load. The SB Speer load is just fine in a longer barrel .38 Special... (just like Steve said above)

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SWCA #3437