Halo
Member
I just got a set of Hornady New Dimension dies for 9mm and I'm pretty impressed with them except I'm now getting up to 0.009" variation in my COL. I loaded up a test batch today and was getting COL anywhere from 1.154 to 1.163. I was aiming for a nominal COL of 1.158.
In contrast my old RCBS seating die hardly ever produced any variation at all, so I'm trying to figure out what's different with this new die. Maybe the seating plug in this die engages the bullets further down on the ogive, and the seating depth variation is due to ogive variation on the bullets themselves? I'm loading 124 grain round nose FMJ bullets. The RCBS plug looks like it might engage closer to the tip of the bullet.
I like the alignment sleeve the Hornady seating die uses and would like to stick with it. I bought it so I could use my RCBS seat/crimp die for crimping only. Any ideas on what might be causing this COL variation?
TIA
In contrast my old RCBS seating die hardly ever produced any variation at all, so I'm trying to figure out what's different with this new die. Maybe the seating plug in this die engages the bullets further down on the ogive, and the seating depth variation is due to ogive variation on the bullets themselves? I'm loading 124 grain round nose FMJ bullets. The RCBS plug looks like it might engage closer to the tip of the bullet.
I like the alignment sleeve the Hornady seating die uses and would like to stick with it. I bought it so I could use my RCBS seat/crimp die for crimping only. Any ideas on what might be causing this COL variation?
TIA