I had the same impressed checkered Rem. 700 BDL in one of those 'interesting chamberings' you mention. Mine was a 6.5 Remington Magnum. My second one, I had had one in a Model 660 with a 20" barrel. When they introduced that chambering in the 700 BDL with a 24" barrel, I just had to 'upgrade' so I bought it in 1971. I still have the barrel (the action was used for a 'hunter class' BR gun) which is marked with an incomplete caliber name, the word Magnum is missing, it simply says 6.5 Rem. ...odd!That's a great vintage 700 remington, they had a Walker trigger which should be replaced and a stock with stamped checkering but the action and barrels were very well made, what cartridge is it chambered in? Most likely 270 or 30-06 but they were made in some interesting chamberings as well like 280.