I don’t have access to live tool results in this turn, but I can share generally accepted information on what can cause a shotgun to explode and how to reduce risk. Direct answer

• A shotgun can explode due to an obstructed barrel, improper or overcharged ammunition, or a compromised firearm component. The most common root causes involve blocked or partially blocked barrels, incorrect ammunition (wrong gauge, magnum loads in non-magnum chambers, or defective factory rounds), over- or double-charged powder charges, and damaged barrels or receivers. In rare cases, mechanical failures or manufacturing defects can contribute.

Key causes and explanations

• Barrel obstructions
  • Debris, mud, snow, or a lodged projectile in the barrel can create excessive pressure when the shell fires, potentially causing a barrel rupture or “burst.” Even a partial blockage can dramatically raise peak pressures inside the barrel. Regular inspection of the bore before and after use is essential, especially in hunting or field conditions where debris exposure is high.
• Wrong or defective ammunition
  • Using the wrong gauge shell (e.g., a 20-gauge shell in a 12-gauge barrel) or loads not appropriate for the shotgun can cause severe pressure spikes or obstruction-related failures. Defective factory ammunition, such as misprimed rounds or charges seated incorrectly, can also lead to dangerous pressure conditions.
• Overcharged or improperly loaded ammunition
  • Handloaded or reloaded shells with excessive powder or incorrect components can produce higher-than-design pressures, stressing the barrel and chamber beyond their design limits.
• Damaged or weakened components
  • A corroded, dented, or otherwise compromised barrel, chamber, or receiver may not withstand normal firing pressures, increasing the chance of rupture under use. Similarly, worn or damaged locking lugs, bolts, or other action parts can fail under pressure.
• Maintenance and condition
  • Poor maintenance, including neglecting cleaning, corrosion, or build-up, can contribute to erratic pressures or obstruction formation. Regular maintenance reduces risk by keeping the bore clear and the action functioning within spec.
• Environmental and mechanical factors
  • Extremely hot or rapid successive firings can contribute to overheating or stress, particularly when combined with other risk factors. Mechanical defects or unusual operating conditions, though rare, can also play a role.

Safety and prevention

• Always treat firearms as if they are loaded and follow proper handling procedures.
• Inspect the barrel for obstructions before loading, especially after dropping the firearm, after a misfire, or in wet/muddy conditions.
• Use only ammunition that matches the shotgun’s gauge and chamber length as specified by the manufacturer.
• Avoid handloads or reloaded cartridges unless you have reliable, tested load data and procedures from reputable sources.
• Perform regular maintenance checks on the barrel, receiver, and other critical components; replace any damaged parts promptly.
• Seek professional gunsmith inspection if there is any doubt about the integrity of the firearm.

If you’d like, specify your shotgun’s make/model, the type of ammunition you’re using, and the conditions in which you’re shooting, and I can tailor the safety guidance and risk factors more precisely.