I recently acquired a small quantity of S & W 38 Special +P ammunition with 90 grain projectiles.
Does anyone have any data on this round?
Thanks.

From an old S&W spec sheet I have:

38Spl 90JSP: MV- 1350 fps.

357Mag 90JSP: MV- 2001 fps.

9mm 90JSP/JHP: MV- 1350 fps.

Make sure the gun can handle the pressure of the +P

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YouJustCantSeeMeLaughingIsAll

Those appear to be from the ammo brochure used thru 1978, when testing was done in unvented test barrels, not real guns. The copies of that brochure I have actually states that. In 1979 a new brochure was produced, and in it S&W used real handguns to test the ammo, and the velocities dropped significantly, in many cases over 20%.

In the 1979 ammo brochure it gives velocities out of 2", 4", and 6" Model 10's for the .38 Special. Soon, when I have time, I'll post side by side comparions from the two brochures, and it becomes obvious what a significant difference it made went they (along with the rest of the industry) moved from test barrels to real guns.