I read somewhere that the new reming primers were the same as the ones that they had before 410 primers ,just changed the name on and package on them.Don't know but I did try the older ones and had made a remark on an earlier post how dirty they shot for me,after firing they were covered in black scoot,I didn't try but a few and went back to using my cci 209 primers don't see the scoot using them.
Wondering to if the winchesters are doing the same in your gun they to come out clean in mine.