The 1910 Model 280 Ross would blow back its bolt, but only if the bolt had been disassembled and re-assembled incorrectly. It did happen, but it was rare. I've got a Model 10 that I shoot with entire confidence, but the first time I shot it was not from the shoulder. One can make cases out of belted magnums of the proper length. I use 375 H&H. Though the original 280 Ross had a bit of a rim, the magnum cases work wonderfully.
TYhat's a nice E-10 there, Boltman. I'm jealous.