I bought a tang safety Ruger 7mm RM. My plans were to re-barrel it to 358 Norma Mag. I was surprised as it turned out to shoot pretty well (about 1 to 1 1/2 MOA). I still have it as 7mm RM, though I re-stocked it as I didn't like the factory stock.
I'm guessing that MD has hit on the issue. Many tangers shot poorly.