I'm I reading this right, your shooting a .903" at 300 yards. Wow, if that's not competitive I'm glad I'm not a match shooter.
What's the dimensions of the "X" ring in the discipline that your shooting?
I use a Redding Competition seater and coat the inside of the case necks with Imperial dry graphite. Still I get slight variations usually not over .001" measured using a Hornady comparator. I check every round as I load them. I usually set the seating die to never go past the depth I want and if it's a little light for whatever reason, a second stroke of the press will usually move it a bit more. My press doesn't cam over and I can seat up to .003" more from a light bottoming out to applying 5-10 lbs pressure on the handle.Well I just measured all my BTO with a 6mm comparator and had .005 difference across the board. Then I took a 17 cal BTO, which is where the stem on the RCBS die pushes down on. So I'm going to take these numbers and adjust accordingly with my die and see where that puts me. Might also place a order for the Forster ultra seater if this doesn't work.
Hey folks
it shoots a .903" group at 300 yards. I use a RCBS comp seater that has been for what I think is hit or miss with accuracy of seating depths.
I'm getting a few thousandths difference from base to ogive. 2.280= perfect; but I'm getting those odd balls that are 2.282-2.285.
Proper annealing is key although somewhat over rated. Before annealing became so popular I wore a .243 Krieger out and never annealed the same brass fired in it. Annealing doesn't fix a donut which could be developing in this case, neither does annealing fix inconsistencies in Neck wall thickness regardless of how good a neck turner you are. I contend that there are neck tension variables in the most perfectly prepped brass. That combined with springing in the softened upper case wall and shoulder area will cause variables in the variations Being complained about here.Proper annealing fixes tension issues. It doesn't intensify them.