Breaker, I read comments like that here all the time, but fail to see how someone can use reloading manuals as proof that FACTORY loads have been watered down. When the poster said "marked as +P", he seemed to be referring to factory loaded ammo.
You may or may not have seen the actual test results I posted a couple months ago comparing older versus newer 38 Super ammo, indicating the factory ammo of today is just as strong was it 70 years ago. I started with 38 Super in my testing because one of the members of this forum who in the past posted frequently on this subject used the downgrading of 38 Super as evidence the same thing had happened to 38 Special.
I have accumulated a lot of old and new 38 Special ammo, and will do that comparison test within the next couple of months. I don't know how it will come out, but I suspect that the significant decrease seen in FACTORY published velocites is due to the industry changes in 1978 that no longer allow using the long unvented test barrels. Even comparing S&W ammo pamphets from before and after the testing changes, the velocities dropped dramatically, with the earlier brochure saying test barrels were used, and the next saying real guns (i.e. Model 10 w/ 4" barrel) were used.