I also have an older M37.
After discussing this older production Airweight with some factory folks, and durability considerations when using different ammunition in it, I only use standard pressure loads in mine.
No reason to abuse a nice older style Airweight. Not even for a few rounds. Not when there are other J's that can be used with the higher pressure loads.
Just my thoughts, though.
Sub Club #9; .40 S&W Club #1953; S&W Club #3913
Retired LE - firearms instructor/armorer