If you look at reloading manuals, the specs change. The Speer Reloading Manual No. 11 lists the max charge of 2400 for a 125gr .357 to be 19.5 grains, while Lyman's 49th Edition lists 17.7 grains to be the max charge. 1987-2008. Interestingly, other powders in 1987, like H110 and Unique have lower max charges in 1987 than in 2008. The point is that what is "within spec" changes over time, and if Buffalo Bore is within spec, then other commercial loads can legitimately be considered to be watered down. And the higher powered boutique offerings might be in response to decades of reduced power commercial offerings.
At the same time published velocities of 1555 (1987) and 1478 (2008) may look significant on paper, but there are so many variables, you can't always believe what you read. If it really matters to you, use a chronograph, do your research, and tread carefully.