MontanaRifleman
Well-Known Member
On the bushings and neck tension what I was getting at is that with bushing you can adjust the tension in .001 increments. With a std FL die, you get what you get. if you don't use an expander ball you will get probably 5 or thou of tension. With the expander ball, you get maybe 2 thou give or take. That's what I shoot for when bushing sizing. The theory is, less tension = more consistency. More consitency in tension itself would come from neck turning, producing consistent neck thickness.
It is definitely possible for necks to become thicker at the base if the brass grows as it's fired. How much of an issue it is, I don't know. If you have long necks and are not seating to the junction, probably no issue at all. That would be another good argument for using the expander ball. My 300 WSM brass did not grow at all, but my 25-06 brass does. The difference is probably the shoulder angle.
I was also just thinking about the .001 runout on my 22-250 and 25-06 brass. That is unturned brass so some of that "apparent" runout is probably due to thickness irregularity and not runout at all.
It is definitely possible for necks to become thicker at the base if the brass grows as it's fired. How much of an issue it is, I don't know. If you have long necks and are not seating to the junction, probably no issue at all. That would be another good argument for using the expander ball. My 300 WSM brass did not grow at all, but my 25-06 brass does. The difference is probably the shoulder angle.
I was also just thinking about the .001 runout on my 22-250 and 25-06 brass. That is unturned brass so some of that "apparent" runout is probably due to thickness irregularity and not runout at all.