Paraphrasing the Northamptonshire war diary for a clueDC North West wrote: ↑23 Apr 2019, 18:54Given your knowledge, do you any information on what ammunition the Firefly was using that day?
Meanwhile, the 3rd Tiger was circling in a panic trying to find a way out. To add to the confusion, Captain Boardman ordered Lt. James to have the shells replaced with armor-piercing shells. These shells would immobilize a Tiger without setting it on fire.
You can effectively conclude that they were firing Armour Piercing, Capped, Ballistic Capped (APCBC) and Armour-piercing discarding sabot (APDS) and of course they would've also had an amount of High Explosive (HE) for soft targets in the loadout. By the time of this engagement early August 1944 they would've had both APDS and APCBC available and tellingly Capt Boardman ordered a switch in ammunition during the engagement.
Hope this helps.