You don’t have to remove the expander ball forever , just change the way you use it
The Redding expander is tapered incorrectly to be pulled out through the brass neck, do this and you distort the brass and it will be measured as runout at the neck
Full length resize with the expander removed, size all your brass, then install the expander and push it DOWN into and through the neck thus sizing it, Redding expanders are tapered correctly to expand when pushed INTO the neck
The necks won’t distort as much this way and your brass stays concentric/straight and true
It’s also true that you can just use a bush on already concentric fired brass without an expander and it will neck size and stay concentric
It’s rare for fired brass to have more that two thou of runout
And don’t forget to record runout the same way each time
Ie are you measuring the extreme movement of the needle left and right (let’s say 6 thou) and recording it as 6 thou
Or are you recording actual runout from the projectile/neck centreline which in that case (no pun intended) would be 3 thou
Runout is the amount of offset from the projectiles centreline, not the total distance a needle moves on a dial
Many many people get that wrong
When you get it wrong you will write down a runout value that’s double what you actually have
Many people have got rid of brass or dies because of that mistake
Bookmarks