Originally Posted by patrick021
I am getting good groups with my rifle usually had a flyer out of 3 shot groups i thought it was me but i checked the run out on my bullets and some were about 4 thous out. I was thinking that this might help me with my groups.
Runout is not neccsarily caused by necks that need to be cut, rather then it could be in your resizing operation. Sometimes, when FL resizing, when you pull the expander back through the neck, it distorts it somewhat, and seats the bullet off center. That is by far the most common problem. Yeah, .004 is considerable runout. Are you using lube on the inside of your necks when you resize? This will help. Also, try to set you decapper dead center of the die and lock it up in that position. These are only a few things that pop up at me when someone speaks of runout. There are of course a lot of other " possibles" , but those are the most common culprits.