I've run into this before with Alex Henry, both times with single shots. First time all brass would stop .040" short, .....had to be their chambering, so borrowed a reamer and just lengthend a tad, .....now works well.

Second time, like you, the problem was brass fired in another gun. Determined that the first gun was a bit oversize in the chamber (most like due to wear), and wasn't being resized the last 1/8" by the dies, so wouldn't fit any of my other rifles in that caliber. Had to make a sleeve to manually drive down to the rim and resize that portion that's normally in the shellholder. Easiest solution became to earmark the oversize brass for that rifle only and keep a separate bunch of brass for the other rifle/rifles that I had.

~Arctic~