and its not like we hand panzers fighting panzer and tigers fighting tigers in ww2. so whats your point?
The point is that ammo loadouts would be based on what the vehicles were given historically and not made up just so you can have some tank with a big cannon. So the point that SmokinLoon is trying to convey is that despite what
you may think, the 105mm Sherman was not a tank killer and the ammo load out will reflect that and would not make it the ideal choice for tank on tank engagements.
Yes, there were cases of T-34s fighting other T-34s, Shermans fighting Shermans, etc in World War II and was far more common than one would think.
Flakpanzer T-34(r)

T-34/76

Sherman tank used by the 5th Paratroop Jager Division during the Battle of the Bulge

A Firefly that was captured and used by the Germans during the Battle of Normandy

SU-85 pressed into German service

Stug III pressed into service with the 5th Guards Armored Brigade

This is a photo of the British captured Panther tank "Cuckoo" that was pressed into service by I think the 4th Battalion of 6th Coldstream Guards Tank Brigade sometime in late 1944.

The Soviets were so fond of using captured German tanks that they would even press captured German mechanics into service to keep the captured tanks running.
This is from an advisory put out by the Red Army about captured tanks.
"It is suggested to the Red Army to use such German tanks as StuG III and Pz IV due to their relability and availability of spare parts. The new German Panther and Tiger can be used until they broken down without trying to repair them. They have bad engines, transmission and suspension."
As you can see, your claim of panzers fighting panzers, tigers fighting tigers didn't happen during World War II is clearly incorrect as I showed that it did happen and happened between other various types as well, like Sherman vs Sherman, T-34 vs. T-34, etc.
ack-ack