So we know the problem is seating die. Im probably the wrong one to tell you HOW to adjust regular seating dies. I only use L E Wilson dies with an arbor press. I know, I know that not nessary for hunting rounds but as everyone knows I VERY OCD with my reloading. WHAT KIND of seating die are you using? DO YOU have it adjusted properly? CAN you post a pic of the way its seat-up? MY QUESS is that you have it= the seating die ran to far down. THis will often cause a bulge. IS IT caming over? HOw far from the shell plate is your die? What brand name die are you using?