I'm at the "fine-tuning" point in load development for a couple of my precision rifles, and want to do a neck-tension test with a minimum of supplies (bullets, primers, powder). Looking for the best way to optimize supplies, and still get a good test. I use a Redding FL Type S sizing die with a whole bunch of different internal bushings available, and the 21st Century full expander mandrel set ... so I have the hardware to do any combinations I want to test. My quandary is that testing a bunch of combinations (bushing alone, mandrel alone, bushing/mandrel combo, mandrel first then bushing, bushing first then mandrel, etc.) will take a ton of time and a bunch of supplies. Anybody got a "best practice" method that can get this done in 15-to-20 rounds? BTW ... I'm not "unhappy" with current neck tension and I'm getting smooth bullet seating with acceptable SD's ... but I just want to make sure I can't invest a little time and get even better results. (Note: I wish I had a way other than "feel" to measure seating pressure, but I don't.)
Left to my own devices, I'd probably "size down" with a relatively compact bushing size, and then do multiple 3-shot group tests "sizing up" with the five different mandrel sizes above and below what I'm currently using to test for both SD and group sizes. Am I on the right track ... or is there a better way to do this using 20-ish rounds?
Left to my own devices, I'd probably "size down" with a relatively compact bushing size, and then do multiple 3-shot group tests "sizing up" with the five different mandrel sizes above and below what I'm currently using to test for both SD and group sizes. Am I on the right track ... or is there a better way to do this using 20-ish rounds?