Bullet and cartraige runout. Whats good?

[Peter M. Eick]

I was playing around with my RCBS case mike I picked up a while back and was testing my bullet and cartraige runout. How does this compare with your experience.

308 Winchester, 168 seirra BTHP's. All are averages

Case prior to sizing .005
Case after sizing .002
Case after seating .002 to .003
Bullet after seating .002 to .003

My analysis is I increase the runout during sizing, but I am not sure this matters a lot. The loads are quite accurate.

 

[dakotasin]

.003 is about average for me at the bullet ogive.

i stopped measuring case necks because thickness consistency is more important, and because if you measure them when they come out of the gun, you'll find they are almost always perfectly straight - and there is nothing i can do about the induced run-out by the die.

anything that measures more than .003 at the ogive is used for fouling rounds, .002-.003 is acceptable use, and sub .002 is used for long range precision...

inside of 300-400 yards, run-out matters not.

 

[Ol` Joe]

Remember too that unless you turn your case necks to even them out you have runout due to uneven case wall thickness. Sizeing just moves the uneven brass from the inside to the out. You`re chasing your tail trying to seat a bullet straight in a off-center hole............. :banghead:

 

[JoeHatley]

Here's an article from over at Real Guns, you may find interesting.

www.realguns.com/archives/origin7mmpt3.htm

Joe

 

[30Cal]

Most of what's written for reloading for highpower shooting says you want 0.006" or less for long range (600yds and greater).

Ty