This tank-net thread has some info on the L46 and 48 velocities in amongst the L/70 etc discussions:
http://208.84.116.223/forums/index.p...c=37158&page=5 at about post 92 on.
If you can make some sense of that (the figures are all over the place, and the charge
seems also to have been de-rated in the later war), and then put some argument re the game figures from official documentation and so on and so forth then we may have a change. Otherwise things will likely remain the same.
Andy