Sorry, just a though, i was just sat thinking when this crossed my mind.
If you've got a semi-auto chambered to 3inch (76mm) that could only hold 2 in the mag and one in the chamber, if you were to out 65mm carts in the mag, wouldn't you get 3 in making the semi auto 3+1, making the shogun illegal, or am i wring, sorry, just when i think about these things, it really bugs me, i mean iv been sat with the tape measure trying to work it out