I recently stopped into a small mom&pop shop looking for .40-82 brass. Since they didn't have any I asked if they had .45-90 brass. They had a pile of boxes of BP loaded Remington brass that was head stamped .45-70 yet was 2.4" long. I asked the young man how they made .45-70 brass longer and he said the company making the loads had a brass stretcher. That didn't sound right so I dug through the boxes and found some cases head stamped .45-90. Anyone got insight into this?