Interesting concept.

Vern

Vern

Morethan1waytoskinacat
Ok this opens the doors for a lot of various opinions but you never know.

What if:??? (probably a dumb thought but...)
What if case necks were turned only to the point of where the neck is actually sized?
Seems like it might not chamber but .....
Many tend to say about brass movement that when fired it pushes brass from inside to outside.

Just in theory would it help, hurt or have no effect on longer lasting or more consistent neck tension.
Im sure its a trash can idea but never the less
 
I thought about that too Francis but figured there might be some problems with the sizing so I posted it in regard to the bushing.
I figured it would have to be a few thou lower since we sometimes move our bullets in or out a little.
 
I've read about something similar. In the article, the necks were turned as far as the bullet was to be seated. The neck clearance was tight such that spring back gave just enough tension that the bullet could be seated to the rim formed by the turned/not turned junction with finger pressure. I think it was on 6mmbr.com.
 
I think you'd see lots of neck separations at the point where the 2 diameters meet. I also think you'd still have to size the whole neck so that you don't start to feel real tight chambering. Is it winter already?

Paul
 
When you turn the neck down to the shoulder (normal method), the potential donut is moved to that low point. Since we don't seat bullets that far down into the neck (and we throw away the brass on a frequent basis) it never comes into play. When you stop cutting the neck at a higher point the potential donut moves to that point. If over time it moves into an area where the seated bullet reaches, you then have the potential of creating a thicker section (the bullet diameter plus the uncut neck). This would not be a good thing creating higher pressure than desired. Remember that the neck will still grow as you shoot and size the brass so the donut (thick section) will also move up closer and closer to the seated bullet.
I would no do that.
Hope this helps.

Larry
 
Vern said:
Ok this opens the doors for a lot of various opinions but you never know.

What if:??? (probably a dumb thought but...)
What if case necks were turned only to the point of where the neck is actually sized?
Seems like it might not chamber but .....
Many tend to say about brass movement that when fired it pushes brass from inside to outside.

Just in theory would it help, hurt or have no effect on longer lasting or more consistent neck tension.
Im sure its a trash can idea but never the less
Click to expand...

I've done them this way. I've also done them Billy Shehane style (turn only to a jamfit headspace leaving the rest of the neck alone) I've got several barrels with long necked chambers, like 3/4 inch long necks.... where they're turned first so there's thick brass ("donut") for a full .200 thou plus.

Any neck you can visualize I've probably got. And none of them "grow" and none of them get tight over time even if you don't size them. Necks ALWAYS spring back IME.

Also IME the only necks to separate are those which are turned deeply into the N/S junction prior to fireforming.


experiencesby




al
 
SGJennings said:
I've read about something similar. In the article, the necks were turned as far as the bullet was to be seated. The neck clearance was tight such that spring back gave just enough tension that the bullet could be seated to the rim formed by the turned/not turned junction with finger pressure. I think it was on 6mmbr.com.
Click to expand...

I wrote that article. Find it, and others, here.

There's not much that hasn't been tried, no matter what your passion. Be it Benchrest or ........:p

http://www.6mmbr.com/compcartridges.html
 
Last edited by a moderator:
Al

Those look like Stepped Necked cases. See my article.

Ray
 
Ray,

I read the article. Good read....

Yes those are most certainly Stepped Necks.

I designed and built that chambering around 1993 and when the 6.5X47L case came out it was close enough that I could shave .008 off my barrels and use them to fireform 30X47L cases! And both chamberings use the same Neil Jones die for a 300.00 savings. I did have to order two more neck bushings from Neil ;)

al
 
Ray as you know Red Cornelison was doing that and other brass customizing many years ago. I might have sent you a few. No way I would go to the trouble that he and others did looking for the Holy Grail.
 
I agree with butch that happened many years ago. The stepped necks worked pretty well in the 222
Of course that was then and with pretty sloppy necked chambers compaired to todays tight necks. Never the less it worked.
 
Butch - Yes, both 22s were Red's cartridges. I don't remember where I got the .30 Cal. That may have been Red's also. I think Mike Bryant has the chamber reamer for the short 22.

Ray
 
Back in the early 80's I had a 6x47 Intl. Then it was called a tight neck. Different definition than used today.
The neck was turned such to fit the chamber that when fired the only thing needed was to reprime, add powder and bullet. No sizing necessary.
I used it for a couple of matches before they disbanded the BR shooters in favor of pistol matches.
 
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