neck tention

[Saxon11]

After all my reading I have been doing, I can't figure out how to adjust neck tension. I know by trimming the neck this will give you consistant tension. I was wondering, is the tension adjusted with your sizer die, or by how much brass you shave off the neck?

thanks guys!

 

[HillbillySniper]

What caliber are you referring too? Are you using a bushing die. IMO you'd only have to turn the neck if your gun is set up as a tight neck you can adjust the tension by changing your bushing size.


Hillbilly

 

[spclark]

Neck tension is a function of the gripping force your case necks exert against a bullet when the cartridge is loaded.

It's controlled by several factors: the thickness of the case neck wall (which is why neck turning is often recommended for consistent accuracy); neck wall temper (which is why shooters anneal their cases); the diameter of the case neck after re-sizing & before reloading; to a limited degree the length of the case neck.

A common measure of neck tension is the difference between a loaded round's neck diameter and the same dimension measured prior to loading a case. Start with a neck sized to .272" for instance, then load a bullet of .260" diameter. If your loaded neck then measures .274" you have .002" neck tension.

For most competitive shooting, neck tension is usually anywhere from .0005 (on the very low end & suitable for what's termed soft-seating) up to .004" in gas guns where stiffer tension is needed to prevent bullets in magazine-loaded rounds from moving under recoil.

Neck tension - for our needs - is adjusted by choosing a neck sizing die bushing of the proper inside diameter. An un-annealed case often has far greater effective neck tension than a suitably annealed case neck, even if the dimensions don't change any, and may require a smaller ID bushing for the same measured "neck tension" than for an annealed case neck.

 

[RonAKA]

Here is a good article that covers it quite well.

Neck Tension - Not Just Bushing Size

 

[270guy]

Here is a good article that covers it quite well.

Neck Tension - Not Just Bushing Size

Just when I think I'm starting to get a handle on this stuff, I find out I don't :. I think when I get a rifle to shoot how I want, then leave it alone . But wheres the fun in that?
Seriously, love this forum, thank you Gents.
cheers

 

[Saxon11]

thanks guys, the article was helpful........the more you learn, the more variables there are to deal with.