Originally Posted by roaddog28

Hi Fox Creek,
Did you read the link I enclosed. The standard pressure 38 special back before 1972 was running at 850 to 900 fps. This round is still below 38 special SAAMI pressures. The SAAMI standard 21500 psi for 38 special. The pressure for the round above is in 18000 range. Todays standard pressure is running at 730 fps for the 158 gr LRN.
Most "+P" rounds today are running 900 fps to 925 fps. Of course there are exceptions but +P now is more of a marketing tool by ammo makers I believe ammo companies downgraded the standard pressure to guard against a consumer shooting the old round in a wornout revolver and having issues.
The original poster on the other forums was talking about a model 10 heavy barrel made in 1971. I believe he got some poor advice.
I am using +P 38s in a`M&P 4 inch made in 1954. No issues. I use for SD Remingtons LSWCHP 158 gr +P. I shoot a box every other month.
Regards.
Howard