I rough cut the oak barn beams, jointed, planed the four legs and let them sit overnight.
After marking out for stretcher mortise, beveling the edges, and turning the pads on the bottom of the leg I headed to the mortiser. I don’t have a 7/8” mortise chisel, and I also wanted a very clean mortise as the tenon is a through tenon. What I did was to use a 3/8” chisel and stayed away from the scribe line. I then went back and cleaned up the mortise by hand with a chisel.