Plus if you review post #21 you will see that for muzzleloading barrels the standards are set by each proof house. There are no set standards as there are in barrels that fire modern, fixed ammunition. So if India accepted the CIP and started proofing their muzzleloader barrels, it would still be their standard. Add to that the primary competitor to the Indian barrels are the Italian muskets..., with the lowest of the proofing standards at 140% over max load with a single projectile. The Spaniards are higher in at 200% but they only test samples, not each barrel. The highest is the British at 250% and double weight projectile with every barrel tested..., yet all the countries of the CIP accept each other's proof marks, but clearly the Italian barrel is not expected to survive a British proof load, but it's still considered "safe".
LD