What would really be nice would be for someone to list what the CUP/PSI maximum is for the old S&W models that have a Rockwell 20 hardness in they cylinder...............
The CUP/PSI for the 70 + revolvers that received heat treatment on their parts.................
for the people that own the older weapons.......

since we all know what the +P pressures are, even though they may be watered down a little.

Why all the shudda, wudda, cudda guessing games ?

There is a lot of room between 755 and 890fps out of a 4" 38 special, to where one might be able to up the odds a little for the home owner.