Neck tension

[kochie]

Is 4 thousands too much ?

 

[GLShooter]

In an AR it us good but you can run less. In a bolt gun I rarely run over 3. I prefer 2 for both platforms.

 

[Dave M.]

I have rifles that shoot best between 1.0-3.5 thou. 4 is pushing the upper limit but as long as you have good inside chamfer to prevent scaling the outside of the bullet jacket, you should be fine. Is there a reason you are using 4? If the answer is, that is where the rifle shoots best, then I would leave it alone. If the answer is, I haven’t tried anything else, I’d say you should shoot 3 and 2 thou as well and let the target speak for itself.
Dave

 

[kochie]

I have rifles that shoot best between 1.0-3.5 thou. 4 is pushing the upper limit but as long as you have good inside chamfer to prevent scaling the outside of the bullet jacket, you should be fine. Is there a reason you are using 4? If the answer is, that is where the rifle shoots best, then I would leave it alone. If the answer is, I haven’t tried anything else, I’d say you should shoot 3 and 2 thou as well and let the target speak for itself.
Dave

Not really I can lessen it I’m necking down 6 cm to 22 last bushing .248 comes to with lapua brass I turned to about 3.5 to 4 thousands I can back it off I guess to .250 bushing and have less

 

[762plinker]

SAYING 4 THOU without any other info is like saying is a 1000 feet high enough.
what gun
what cartridge
what bullet weight
what type of shooting
single fed or mag fed ???
just to start

 

[kochie]

SAYING 4 THOU without any other info is like saying is a 1000 feet high enough.
what gun
what cartridge
what bullet weight
what type of shooting
single fed or mag fed ???
just to start

Well I did say what gun look above 23 cm

 

[mousegunner]

What dies? I reduced my expander by polishing with 1000 grit wet or dry but my expander was bigger and I needed smaller to get the neck tension I wanted.

 

[kochie]

Well I did say what gun look above 23 cm

22 cm

 

[Coyotefurharvester]

What is your neck clearance with a loaded round? I have a 204R that shoots sweet with up to 0.006 neck interference, but my hunting loads are 0.0025-0.003.

 

[TheCZKid]

On a bolt gun you can tune it to what shoots best. In an AR, it at least has to stay in place with the bolt slamming into battery. I learned the hard way, with a 20 Practical AR that I 'thought' I had enough tension. I did seating depth tests, but my bullets were Always shooting forward into the lands, every time I chambered a round. That took me over a year to finally catch that... a bit embarrassing, but a good lesson.

 

[762plinker]

4 thou is way to much in a bolt gun, but i have no faith in a 22cm so oh well

 

[KMart]

^^^^^^
It is not, if .004 produces the smallest groups.

.004 NT is highly recommended in the 30BR

 

[jelenko]

On a bolt gun you can tune it to what shoots best. In an AR, it at least has to stay in place with the bolt slamming into battery. I learned the hard way, with a 20 Practical AR that I 'thought' I had enough tension. I did seating depth tests, but my bullets were Always shooting forward into the lands, every time I chambered a round. That took me over a year to finally catch that... a bit embarrassing, but a good lesson.

What neck tension were you using when the bullets were jamming into the lands?

 

[Maximus1840]

I use 2 thou for 22CM. No issues

 

[moondog]

Only way to know is test! When I was doing load development a couple years ago on my 300PRC, I had some that seated unusually hard. I segregated them and shot the last at 1200 yards. Eye opener for sure. They shot much tighter than the .002.
Was able to confirm again with a .005 bushing. Would have never thought to go that tight if I didn't have a few mistakes to send. Seems to me in my Testing, bigger boomers like a bit more but that's in mine.

 

[Ruger15151]

So... I will tell you that some top benchrest 1000 yard shooters use up to .005 neck interference in their 6mm rounds without annealing. I can also tell you that a member of the FTR USA Shooting Team uses .005 neck interference in his .308 rounds.

I have run up to .005 neck interference in my 6BRA F-Class rifle.

Neck interference and neck tension are NOT the same thing. .002 neck interference on a .015 thick neck wall does not give the same neck tension as .002 interference on that same neck that has been turned down to .011. Softer brass gives less neck tension than harder or work hardened brass using the same sizing bushing.

Don't let anyone tell you what is right or too much because most of them have never tested at distance. Brass manufacturer, annealing vs not annealing, neck turning vs not neck turning, neck thickness, powder, primers, and I'm sure a lot of other variables affect what your neck tension actually is and what your rifle likes.

Test neck interference in your rifle at the maximum distance you will be shooting to see what provides YOU the smallest groups in YOUR rifle. That's where you will find the right answer.

 

[TheCZKid]

What neck tension were you using when the bullets were jamming into the lands?

What I know is initially I was using a 226 bushing in my S die, with no neck turned LC brass made to 20 Practical. 226 was not enough to hold the bullet in place. I then tested the 225 and it consistently held it. 224 I thought was overkill, so I have used the 225 since then. I don't have good enough calipers to measure exactly how many thousands it is. Hope that helps.

 

[kochie]

What I know is initially I was using a 226 bushing in my S die, with no neck turned LC brass made to 20 Practical. 226 was not enough to hold the bullet in place. I then tested the 225 and it consistently held it. 224 I thought was overkill, so I have used the 225 since then. I don't have good enough calipers to measure exactly how many thousands it is. Hope that helps.

Thanks guys .250 loaded round

 

[Coyotefurharvester]

If you finish with a 0.248 bushing and loaded rd is .250 you probably are under 0.002 neck interference because of spring back.

 

[kochie]

If you finish with a 0.248 bushing and loaded rd is .250 you probably are under 0.002 neck interference because of spring back.

I will have to go remeasure now can’t remember if loaded or unloaded? I think you might be right. I’m just starting to get back in too reloading been several years