There is truth that an overload, but safe load can blow powder out the barrel before it has all burned to develop pressure. This is particularly true in the snubbies.
A lot has to do with the burn characteristics of the powder. A fast powder will build pressure faster. A slow burning powder will develop pressure more slowly and be more apt
to expel the bullet before the powder has developed full pressure.
Look to your reloading manuals and also check the powder manufacturer's web sites to determine the best load for YOUR gun, paying particular attention to the barrel length they use in their testing. Most manufacturers will answer questions through their web sites, also.
So, the answer to the question you asked is, "Yes, no and maybe."
If a manufacturer or reloading manual says a particular load will build 17,000 PSI crush at maximum load, they are just saying that a heavier load is not recommended. There might be safety reasons, or it might be that the case will not hold more with that particular bullet and still let the bullet be seated to meet maximum overall length, or.... The thing is, they don't actually tell you why that is the maximum, but the rule of (keeping your) thumb is to not exceed what the book says is max.