That is in fact a false statement, L16A1 propellant charges have in fact given inaccuracy issues when firing Charm three ammunition, isnt L27 and L27A1 designed for L30. you also have designed a L30A1. I will not even go into the Challenger 2 trials conducted by the Greeks who in fact found accuracy issues with a wide array of projectiles, the issue is the charges when fired during extreme temperatures, just ask yourself why the Arjun went with a full size combustable cartridge, I would agree with you that a design change would have to be done to the rear of the turret for a bustle loading system, but this should not be a show stopper or cost loads of money for this upgrade, and why even place a bulk supply of ammunition in the hull, not saying that it cannot be done because it can be done with the safety feature of blowoff panels as demonstrated on a XK2.
Challenger 2 not going with a L55 was decided when.