As you choose.
I trust my point is apparent, that over the counter commercial cartridges are seldom 2 3/4" when fired despite what is marked on the box, that Parker intended chambers to be shorter than the fired cartridge, and that the minimal pressure rise from a slightly long cartridge extending into the forcing cone is beneficial and intended. Measurements of original marked 2 1/2 shells that we have shown here are longer than 2 1/2 when fired. Measurements of original marked 2 3/4" shells that we have shown here are frequently shorter than 2 3/4 when fired.
TPS has a table listing chamber lengths. In the end though, measurement is the only sure way to determine what it is. Your Trojan at 2 1/2" is exactly what it is supposed to be, see table at p 519 TPS. Depending on present condition, it was intended to handle over the counter cartridges up to service working loads of 9500 psi, see table, p. 515. I am sure you realize that opens a broad range of suitable cartridges .
For what its worth, several of us last season went through about a pallet of AA's through various grades of Parkers, including A's, damascus and fluid, C's and D's.
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