My observation from other threads on this topic are two fold. First, there seems to a view that lengthening the chambers could/may/would weaken the chamber walls where the pressure is the highest. Second, there are views that Parker would say it was OK because the "paper" shells would open out to form a tight seal and it was OK to shoot 2 3/4 shells in the shorter chamber.
Now that we shoot plastic hulls that may not be as true as it was back in the day.
I am not an expert on the topic but I can say that I have shoot thousands of 2-3/4 shells in a 2-5/8 chamber with no ill effects.
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