Originally Posted by dmproske
I have a question related to this....
Depending on what device you use to measure runout, the case body can determine what results you get?
I use a sinclair runout gauge. The case body rides on roller ball bearings. If there is a high spot or bump on the case body where I am rolling it, it will show on the gauge. I have to really pay attention to make sure I am not getting a false reading.
I use the gauge from Sinclair also. To be honest, I was doing it wrong for the first year. I cradled only the brass case and had the gauge on the bullet. This is wrong. I always wondered why I was getting 3-6 thousandths in runout.
The rear of the case is cradled but the bullet where it meets the case mouth sits in the front cradle with the gauge on the top side. My runout went to virtually zero and most are less than .0015. I spoke with a guy at Sinclair today and he told me this was the correct way to do it.
In fact, ever since I had my sizer die's necks honed, runout is about zero.