RE: Lightweight Synthetic .243 rifle?
A blind magazine is one that doesnt have a floorplate to remove the cartridges. A good example is a Rem 700 ADL, the cartridges must be loaded from the top and to be removed they must be cycled through the action.
Another option would be either a a Sako M75 or M85 FinnLite in 243 Win. They offer 1 MOA accuracy and a removable stainless magazine.
On another note I wouldnt call the Tikka junk but I had a T3 Lite in 270 WSM that patterned much like a shotgun with a modified choke, needless to sayit went back to the dealer.