Runout...can it be a measured on paper at 500-1000 yds?

[BenPerfected]

Does it really matter?....when?
Ben

 

[LCazador]

Does it really matter?....when?
Ben

I think that really depends on your shooting discipline. As a benchrest shooter having shot out to 1000 yards, yes it matters and yes it will display itself on your target. I wouldn't think of investing all kinds of money on a rifle, optics, a great shooting rest, and then not make sure my ammo was concentric. Just a little more work can make a big difference!

 

[Shynloco]

Well, speaking as a layman and from a common sense approach (not technical as I'm not that well equipped), it strikes me that Concentricity AKA RUNOUT, is useful to all distances of shooting, perhaps more in some disciplines than others. The reason I say that, is that we strive to obtain the best possible RUNOUT simply because we are trying hard to make sure the bullet enters the chamber as perfectly CENTERED as possible and maintains the same even plane as it travels down a concentric barrel. And the further out the bullet goes, the harder it may be for that bullet to stay on the same CONCENTRIC plane (because of forces the bullet is experiencing like wind, yaw, etc) while in flight. Now I only shoot 100 yds anymore, but I have noted that the better the CONCENTRICITY/RUNOUT, the tighter a good load in any of my rifles shoots. Just my .02 worth.

Alex

 

[Intheshop]

Anealing and getting really low run out #'s has made a noticeable difference in my tackdriver varmint rigs.May not show up as much for the next guy,can't say?

But reason for post is;on both of the above,once your process is streamlined,it sort of just falls in place along with other chores on the bench.

 

[oakfig]

For me having consistent neck tension yielded better results at 5-600. I could have .005 or even .007 runout and it didn't seem to change much. Where a hard seat vs soft it showed vertical differences. That's just my experience, I'm sure every barrel has its own story to tell.....

 

[Richard Coody]

Does it really matter?....when?
Ben

well it depends on what you are trying to do.

i have been working with a 6br for a while now.

after doing all the steps from weigh sorting brass, sorting bullets by weight and base to ogive, neck turning, annealing, using adam's autotrickler, custom dies, sorting loaded rounds by seating force using wilson dies and 21st century shooting hydro press and finally sorting by concentricity.

i am shooting .005 off. the final rounds with perfect concentricity shoot in the 1's and the culls shoot in the 2's. culls are all less than .003

 

[Prose]

If you were to have extremely non concentric rounds and load them in a chamber, noting their orientation (say 2 o'clock), you could probably predict where that hole would be compared to a concentric round, all other things being equal. Same could be said about primers or charge weights. That being said, all other things would have to be equal and if your concentricity is really bad all other things are probably not equal.

 

[4xforfun]

For me having consistent neck tension yielded better results at 5-600. I could have .005 or even .007 runout and it didn't seem to change much. Where a hard seat vs soft it showed vertical differences. That's just my experience, I'm sure every barrel has its own story to tell.....

.005 - .007 runout in what?

 

[4xforfun]

Still trying to figure this thread out. Runout? Runout in what? There are eleventeen different kinds of "runout".

Tod

 

[oakfig]

.005 - .007 runout in what?

In the seated bullet.

 

[4xforfun]

In the seated bullet.

Depending on jump, that makes sense. If you are running .040 jump or more, and you are off a few thou either way it's no big deal. BUT......start with an .005 jump or jam and be off .005 - .007 and it could be a disaster.

But, I don't see in the OP exactly what kind of runout he is talking about.

If you had .005 - .007 runout in neck tension, or loaded round neck thickness, or bullet ojive to ojive length, or 10 other places, what would your groups look like?

Tod

 

[mikecr]

If you had .005 - .007 runout in neck tension, or loaded round neck thickness, or bullet ojive to ojive length, or 10 other places, what would your groups look like?

These attributes are not runout, but other variances.
And anecdotal results w/resp to loaded runout would need some specific build/fit conditions to consider.

 

[4xforfun]

Runout is any inconsistancy. Bullets have runout. A press can cause runout. Bad dies can cause runout....Brass can have runout. Loaded rounds can have runout. Inconsistant neck thickness is considered runout.

 

[mikecr]

I can make necks with thickness variance measure under 1thou in runout.
Do you call powder variance -powder runout?

 

[4xforfun]

I can make necks with thickness variance measure under 1thou in runout.
Do you call powder variance -powder runout?

One thou runout is still runout. If you are measuring to the nearest millionth of an inch it is huge....to the nearest inch....not so much.

I guess our definition of runout is differnt. Powder charge differences is different and I wouldn't call it runout. Same with velocity differnces.

The question still remains...what, exactly, is the op talking about.

Tod

 

[Richard Coody]

Depending on jump, that makes sense. If you are running .040 jump or more, and you are off a few thou either way it's no big deal. BUT......start with an .005 jump or jam and be off .005 - .007 and it could be a disaster.

But, I don't see in the OP exactly what kind of runout he is talking about.

If you had .005 - .007 runout in neck tension, or loaded round neck thickness, or bullet ojive to ojive length, or 10 other places, what would your groups look like?

Tod

when we speak of runnout we are usually speaking of the concentricity of the loaded round measured at about the ogive of the bullet.

i also measure concentricity on fired brass and after sizing. tells you where to look for your problem.

lots of things can cause it but the concentricity of the final loaded round tells the tale.

 

[dkhunt14]

I believe that if shooting in the lands, it is less critical them jumping them. In the lands would straighten them to some degree. Matt

 

[Richard Coody]

I believe that if shooting in the lands, it is less critical them jumping them. In the lands would straighten them to some degree. Matt

i agree. jammed eliminates problems with concentricity

might be the reason so many competitive shooters jam VLD's

 

[4xforfun]

i agree. jammed eliminates problems with concentricity

might be the reason so many competitive shooters jam VLD's

Or it might be the fact that it shoots better that way.

 

[Steve morgan]

Anealing and getting really low run out #'s has made a noticeable difference in my tackdriver varmint rigs.May not show up as much for the next guy,can't say?

But reason for post is;on both of the above,once your process is streamlined,it sort of just falls in place along with other chores on the bench.

It makes a difference in my riles