Well, not Swedish, but going way back to the original 360 2 1/4, in 1873 Eley made coiled brass cases with paper patched bullets with a wooden nose plug. (Is this the source of - you plugged him;-)?) I have a Swedish write up (unfortunately in Swedish and technical things do not translate well with Google translate) that says there were 3 classes of loads. One was target loads with lead "spoked" (grooved?) bullets, another was "bird loads" with "smooth" bullets, and the third was game loads.