Rifle is an 1891 Engineers carbine.
Used an old Pacific die set to form some 7.65x53 from Win 30-06 brass. Annealed before forming, reamed necks to thin them after forming. Easy chambering and extraction. I'm aware the Pacific die is among the shorter ones, so I raised the die to ensure shoulder dimension was in the 1.816 range (vs screwed down with shell holder touching die is ~1.789 iirc). Loading was a breeze. Imr3031 40-42gr, 150gr hornady. Shot well.
BUT.... after firing, I'm getting a sharp line at the shoulder.
In the pics, the row of cases are all fired except the far right; the far right case is as-formed.
It's not necessarily 'sharp' but I would imagine this will become an issue, if not now, then if I try to fire these again.
What gives?
Closest thing I found online is this...
https://www.carolinashootersclub.com...oulder.223978/
Here are my pics