Trev
40 Cal
I can't see a shorter jump, less travel between ignition and forcing cone yes, but distance of jump is a constant, as built into the frame and barrel connection.A shorter jump to the forcing cone and rifling. Theoretically this allows for greater accuracy. I’m not convinced of that personally but others are.
Reason that I asked though is because in my mind there is bug saying that over the given 25grns that an inch of travel inside the chamber would increase the velocity of barrel entry and allow a greater exit velocity, like making the barrel an inch longer, but truthfully, I'm not at all sure that bug in my brain knows anything.