I recently bought a 744 with the short under lug and vented rib 6" barrel. The gun shoots fine, except it is very high with Win factory 240 gr. The rear sight has bottomed out, so I can't lower it anymore. Tomorrow I am going to try it with a full lug shroud, just to see if that may be the problem.
It's a Monson SB005XXX and the rear sight has allen screw adjustments. I also have a SB010XXX 744 with the Hunter pack, but it has slotted screw adjustments for the rear sight and shoots to POA with plenty of daylight under the rear sight.
Any suggestions?