A good local gunsmith will tell you if its OK for modern powder.
Just a suggestion here. And NO guarantees.
- Find a max load for that gun. (21/2" case)
- Load up a cartridge same max load + 1 grain powder
- Take out in field, wrap up in an old blanket (very effective at stopping shrapnel)
- Stake / tie down
- Fire using long string and hiding behind BIG tree. LOL
- Check for damage.