People use the Export in all different chambers. If you meet someone who uses, say, 7.62 x 63mm in their Export rifles you aren't going to be exchanging ammunition. The point is that the Mk III is better for 7.62x51mm and 7.5x55mm, the most common calibres, but for everything else the Export is better because it's larger and more capable of rechambering, can fit a larger bolt, etc etc.







