This cuirass failed to stop a cannon ball at the Battle of Waterloo.
This brass over steel design would have GURPS DR 10, front and rear.
The 6dx5 pi++ ball doesn't look like even slowed down passing through the (likely) 11 HP torso of the hapless carabiner François-Antoine Fauveau.
The average hit from that ball is 105 points, so 95 penetrates to deliver 190 points of damage to Frank. 124 more than needed to get to auto-death. That drops back to 62 points to punch through the back plate with 52 points remaining for anyone behind Monsieur Fauveau.
I'm betting he felt pretty safe in that before he took that hit too.
UPDATE:
Safe from hand weapons, maybe pistol ball. Not much will stop a cannonball, and if it did, the energy transfer from stopping the shot would still probably be fatal.
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