A few gunnery facts.
Given the date of sinking they are AP 15 inch shells on Repulse with a bursting charge of 48.5 lbs (22 kg) of 70/30 shellite. Prince of Wales had 14 inch guns the APC shells had a smaller 39.8 lb (18.1 kg) charge. Later in the war KGVs carried 5 HE shells v 95 AP per gun the HE shells had a charge of c107 lbs. (48.5 kg). Still, I wouldn't want to be near one that could go off at any time. The 4" HA/LA guns on Repulse used solid shells and 5.25" HA/LA guns on PoW used a combination of shells with bursting charges of 3.25 lbs (SAP) / 6 lbs (HE) of TNT. In PoW the guns had a theoretical AA ceiling of 46,500 feet, a report on the loss of PoW concluded the guns would have been much more effective against the attacking aircraft if the crews hadn't had insufficient training.