The idea of lead shot from a 2&3/4" shell squeezing its way through the forcing cone of a gun with 2&1/2" chambers strikes me the same as that same shot leaping from a 2&3/4" shell and squeezing through a forcing cone another 1/4" away. The later seemly more omnious if steel shot is included but is apparently not of concern to gun makers? A more gentle taper on a forcing cone, if it doesn't devalue the gun or create too thin a wall or cost too much, maybe allows for less shot deformation or damage to the shot cup and therefore is a good thing. I hope it doesn't matter because I don't want to do it. Anyway since smokless powders take up so much less space than black powder did, I don't understand why shotgun shells keep getting longer?