Which effect reduced artillery range when early cannons overheated during prolonged sieges within Roman fortifications?

💡 Explanation

When early cannons overheated significantly, thermal expansion occurs because increased temperature loosens the seal between the barrel and projectile causing gas blow-by and reduced projectile velocity. Therefore, range decreased due to blow-by, rather than propellant detonation, carriage failure, or obstruction, which require other vulnerabilities.

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