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JFrank
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Most guys accept the term neck tension, I seem to prefer bullet hold while others refer to it as interference fit. Maybe some new internet/ u tube reloader will come up with a new term.
Good ol Guffey quote attached.
Does Neck Tension matter ?
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Good ol Guffey quote attached.
Varminterror
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Lol, I feel ya. “Neck tension” might not make much sense, but nobody knows what anyone means when we say “neck interference,” and may God help you if you say “bullet grip” or “bullet hold” online.
To me it is, most definitely
People are people?
Soonerpesek
Member
Neck tension and/or bullet hold are probably the best way to describe it.........
there are at least 3 types of interference fit, 2 of which are not applicable to what we are using it for.....................
there are at least 3 types of interference fit, 2 of which are not applicable to what we are using it for.....................
How else would you do it?
Yea, everyone knows what we are talking about when we say neck tension, even if we can’t agree on a strict definition.
Like surface tension on water.
Iowegan did some resistance testing with spring set ups, I bought springs, but never went forward with it.
I just go by the old feel of resistance when seating bullets, which is why I like doing it with an arbor press and hand die for seriou work.
You don’t have to do it that way, but it works well for me. I also do it on my Projector seating only, which has a pretty good feel, but not as good as the arbor press/hand die setup.
kmw1954
Member
Trying to not detract from the topic but on this note. I do 3 shot group initial ladders to try and determine a starting point. From there I shoot multiple groups of the same load over a number of session to verify repeatability. As I do not rule out shooter good and bad days.
At the same time I do not shoot from a fixed rest. I shoot as I would normally use it. The most accurate or consistent load means nothing if I cannot control it.
Soonerpesek
Member
Interference Fit
In the interference fit, mating parts in sub-assembly or main assembly are joined tightly together and no relative motion is possible. The minimum permitted diameter of the shaft is larger than the maximum allowable diameter of the hole. In this case, the shaft and the hole member in any sub-assembly or main assembly are to be attached permanently and used as a solid component but according to the application of this combination, this type of fit can be varied. Interference fit is used for permanent or semi-permanent assembly of parts, which require rigidity and alignment and no relative motion, such as dowel pins and bearings in casting. The difference between the size of the shaft and the size of the hole in any sub-assembly or main assembly is called interference or negative clearance or negative allowance. Interference fit has limits of size so prescribed that interference always results when mating parts are assembled. Transition fits are of two kinds namely driving or press-fit and shrink or force fit. To assemble, parts are usually pressed together using an arbor pressThe interference fit can be sub-classified as follows :
Shrink Fit or Heavy Force Fit
It refers to the maximum negative allowance. In the assembly of the hole and the shaft, the hole is expanded by heating and then rapidly cooled in its position. It is used in the fitting of rims etc.
Medium Force Fit
These fits have medium negative allowance. Considerable pressure is required to assemble the hole and the shaft. It is used in car wheels, armature of dynamos, etc.
Tight Fit or Press Fit
One part can be assembled into the other with a hand hammer or by light pressure. A slight negative allowance exists between two mating parts (more than wringing fit). It gives a semi-permanent fit and is used on a keyed pulley and shaft, rocker arm, etc.
Am missing Guffey in several forums. While blunt, he straightened out my misuse of technical terms several times. And it was appreciated
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JFrank
Member
I think I’ve posted plenty of information on that topic.
Anchorite
Member
This. I think of it - and describe it as the “snap” - of the pressure ring on the bullet as it pops into place in the neck when you seat the bullet. And I use hand dies and an arbor press as well. It’s all about the feel.
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JFrank
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I’ve never heard or felt any snapping or popping while seating a bullet. Is this just a flat based bullet thing ?
Varminterror
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Ditto.
Nothing should be “snapping” together for a parallel cylinder bearing surface sliding into a parallel cylinder case neck.
I’d consider any snapping sensation to be a defect.
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JFrank
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Just when I thought the thread was finished. :-(
Varminterror
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This sure seems to fit as the definition of "Interference Fit" applicable for what is commonly called "Neck Tension."
Varminterror
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Well, you DID open the thread to discuss the topic, right?
Yep, and immediately after the other thread was closed, so……..
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JFrank
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I had both topics in mind, before I started the first one, it looked like both had run there course with input. so what’s your point ? I’ve tried to stay on topic and add positive input, we could be discussing your favorite bear gun load or show me your whatever powder stash.
Varminterror
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The writing might have been on the wall in the other thread, but this one had a ~7hr head start before the other one got locked. That thread forked in the woods, distracted by folks bending ammo in a vise to waller out case necks and pretending it was relevant to how far ammo gets corrected in a rifle chamber, and question of neck tension and consistency redirected here.
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JFrank
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Ok, I won’t start anymore threads. Yall take over.
Soonerpesek
Member
Well, someone wanted pictorial proof, and they got it, then they didn’t have anything to say….
Maybe they can tell us again how concentricity doesn’t effect interference fit or press fit or tight fit or bullet hold or neck interference or bullet grip or bullet holdy force or positive projectile pound force or hold on to yer britches or hold on to your heart or don’t stop believin’ or …………………
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Varminterror
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Nah, there was just a small misconception on timeline. No harm, no foul.
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JFrank
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Guys, I put in my work. I’ve always been willing to share, I like helping people where I can but I’m about done. I stopped giving advice after getting my head sawed off for trying to help a guy awhile back. “My bad”
I do not have to share my work, I can keep my findings to myself and guys can shoot their groups until they stumble across a load. IDC..
If someone doesn’t agree with my work they should post their own work to support their position.
I don’t have to answer private messages asking for help either.
If this post gets me banned , that’s not my intention .. then so be it.
I do not have to share my work, I can keep my findings to myself and guys can shoot their groups until they stumble across a load. IDC..
If someone doesn’t agree with my work they should post their own work to support their position.
I don’t have to answer private messages asking for help either.
If this post gets me banned , that’s not my intention .. then so be it.
nettlle
Contributing Member
Size to size is a press fit. An inside neck diameter of .308 with a .308 diameter bullet is a press fit.
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