well I think I need a little help! let me give a little background on me. I have been handloading since 1967 so I am not exactly new to it. I have been casting since 1981 I have been fighting the battle of the bulge in straight wall cases for years. I had a lot of problems with 45 acp years back. I started using an M die and a Redding competition seat die and it helped significantly. well today I tried loading up some full HBWC in 44 special and they bulge so bad that most wont fit in the chamber. I am using an M die and the seating stem in the RCBS die is not totally correct but in dose seam to sit square and straight on the nose of the boolit, I don't think the stem is the whole problem because even with the correct one in 38/357 there is still a significant bulge at times. and there doesn't seam to be certain brand of brass that helps or hurts the situation. is there any better seating stem I can order? I am using single stage RCBS A2 and 2A presses. for what ever reason the concentricity is not correct. are there any ideas,,,,,,,,,,,,,,