38spl cases loaded as 'mini mag' loads for my 357mag leverguns. I wanted the same load density as a 357mag to give me medium performance in my 357mag leverguns. I found that if I used 13.5grns of H110, Wolf SRM primers, and a Zero 158grn JSP bullet, I'd achieve my desired load.
Quickload calculates the peak pressure as 21,200psi so this is definitely not a load for a 38spl weapon, however, out of a 357mag, it's a great min-velocity and plinking load out to 200+ yds as it clocks at 1,496fps out of my 20" carbine (Same bullet in my 357mag load clocks at 1,822fps).
The case density is a bit lower than a 357mag, there are no overpressure signs, and I've test fired a 20 case lot of 38spl brass with this load with no issues after 10 reloads. However, I did reload a case to failure and the case separated about 1/4" above the rim.
I didn't feel any difference but when I cycled the action the small case head popped out, leaving the rest of the case in the chamber. I opened the action and let it cool on a gun rack. When the chamber cooled enough, the remaining brass just fell out.