Which risk increased significantly with the perfection of uniform-bore cannons by the mid-19th Century?

💡 Explanation

With perfected uniform-bore cannons, higher tolerances created greater pressures when firing became more rapid, leading to increased risk of catastrophic breech explosion because of exceeding material strength. Therefore, the explosion risk grew, rather than fragmentation, overheating of rifling (rifling was less prominent in uniform-bore), or corrosivity which depend on different weakening mechanisms.

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