I recently noticed a strange event while at the range this week. I had a box of 50 rounds of 44 mag that I had reloaded with Hornady 180 grn XTP's I had bought before I got the swaging equipment. I had loaded 10 grns of Unique with Magnum primers. I also had some home swaged 180's loaded the same way. I was using a mid 70's vintage New Model Ruger SBH with 7.5" barrell. Only modification ever done to the SBH is replacing the base pins. The problem was that at 25 yds the store bought shot 12" to 14" lower then the home brews. I could understands maybe a couple of inches but this amount baffles me.
Any comments?
I have never measured the difference from the cylinder and the forcing cone. Accuracy in the same types (swaged vs store bought) was acceptable for my ability.