I recently came across a cartridge that I think may be an original .70-150, but maybe not, and I’d appreciate some help deciding yes or no. The cartridge does not have the look of the typical repro to me. The bottleneck in the case is smooth and consistent, as is the mouth crimp; very nice. The .22 blank in the nose with raised X headstamp looks good, as does the base with raised ring and no headstamp. In Cartridges, Logan shows and describes one of these on page 154, and this round’s dimensions match Logan’s. This round is a “thin rim” version like the one Logan shows.
I have owned an original “thick rim” display board dummy, and the first question is whether there is such a thing as an original live thin rim version of the .70-150. Because it seems that there was at least one rifle made in the caliber (a modified lever action shotgun), it makes sense that live cartridges did exist. But is this one of them? There are two differences between this round and Logan’s; my primer does not have a circled W and the X on the blank in the nose does not have a circle around it. I’ll have it at SLICS, so you can look it over and offer your expert opinion. Thanks.