I've heard lots of claim that if you don't get the "cam over" feel at the end of the sizing stroke, you'll get inconsistent bump. So depending on chamber geometry that might require competition shell holders. I didn't want to spend that much money on the kits and I've never noticed it on smaller cartridges, but last night I was setting up my die and sizing some 28 Nosler brass, I noticed about +/- .001 variation. I started thinking about springback and decided to pause for a second keeping pressure at the top of the stroke, VOILA. Everything from that point was either dead on, or bounced +.0005. I don't trust my calipers to accurately resolve .0005, so I'm calling it as good as it will get.
For those interested in details I'm using Hornady FL Custom Grade die set (not match), with the dreaded expander ball left in. I use lanolin/alcohol homemade lube and toss my brass in a tumbler full of white rice for an hour or two afterward. It takes a few minutes to tumble brass in the media separator and pick the rice out of a few primer pockets with a small drill bit, but my sizing process has never been smoother.
Hoping this little trick will save someone some coin and frustration.
For those interested in details I'm using Hornady FL Custom Grade die set (not match), with the dreaded expander ball left in. I use lanolin/alcohol homemade lube and toss my brass in a tumbler full of white rice for an hour or two afterward. It takes a few minutes to tumble brass in the media separator and pick the rice out of a few primer pockets with a small drill bit, but my sizing process has never been smoother.
Hoping this little trick will save someone some coin and frustration.
