Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Neck tension
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="MagnumManiac" data-source="post: 2218389" data-attributes="member: 10755"><p>Friction is simply friction. Friction will also change with annealing and spring back, even though IF stays the same. Annealing is the most efficient way of controlling spring back, this is why we do it every firing.</p><p>Seating force changes, if I use HBN coated bullets and non coated bullets, seating force is different, but IF is the same and the resultant tension of .001" is still the same. I still lube my necks when using HBN, it's just part of my routine.</p><p>As I alluded to earlier, using a neck lube changes friction, I use powdered graphite because I found my rounds would change, even if only 2 weeks sitting, from the day they were made. Velocity became lower, but more consistent.</p><p>I find, also with lubed necks, that consistent ES/SD numbers are difficult to obtain when the necks are left 'dry', and get worse as when stored that way.</p><p>I had a match all set to go just before COVID, and left those rounds in my ammo container for several months, just pulled them all about 2 weeks ago. They all had about the same amount of pull force, which tells me my lubed necks are doing their job.</p><p>I have pulled bullets on in-lubed necks that had sat for yeats and they were cold welded and even had a few necks rip off.</p><p>I've never understood the concept of seating force measurement, the more important measurement would be pull force, even though as soon as the primer ignites, the case is already pressurised and neck expansion is starting.</p><p>I also find that neck tension is far more critical the larger the calibre is.</p><p>My 30 cals like .0015"-.002", one likes .004", but that's not the norm.</p><p>My 33 and 37 cals like .0025"-.003" and my 416 likes as much as it can get, I tried a crimp, but haven't run it over the Pressure Trace yet, as I have run out of transducers.</p><p>I am interested to see what difference a crimp will make to this round, as over the chrono, velocity was erratic without the crimp and came into line with it.</p><p></p><p>Anyway, this is my take on it.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2218389, member: 10755"] Friction is simply friction. Friction will also change with annealing and spring back, even though IF stays the same. Annealing is the most efficient way of controlling spring back, this is why we do it every firing. Seating force changes, if I use HBN coated bullets and non coated bullets, seating force is different, but IF is the same and the resultant tension of .001” is still the same. I still lube my necks when using HBN, it’s just part of my routine. As I alluded to earlier, using a neck lube changes friction, I use powdered graphite because I found my rounds would change, even if only 2 weeks sitting, from the day they were made. Velocity became lower, but more consistent. I find, also with lubed necks, that consistent ES/SD numbers are difficult to obtain when the necks are left ‘dry’, and get worse as when stored that way. I had a match all set to go just before COVID, and left those rounds in my ammo container for several months, just pulled them all about 2 weeks ago. They all had about the same amount of pull force, which tells me my lubed necks are doing their job. I have pulled bullets on in-lubed necks that had sat for yeats and they were cold welded and even had a few necks rip off. I’ve never understood the concept of seating force measurement, the more important measurement would be pull force, even though as soon as the primer ignites, the case is already pressurised and neck expansion is starting. I also find that neck tension is far more critical the larger the calibre is. My 30 cals like .0015”-.002”, one likes .004”, but that’s not the norm. My 33 and 37 cals like .0025”-.003” and my 416 likes as much as it can get, I tried a crimp, but haven’t run it over the Pressure Trace yet, as I have run out of transducers. I am interested to see what difference a crimp will make to this round, as over the chrono, velocity was erratic without the crimp and came into line with it. Anyway, this is my take on it. Cheers. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Neck tension
Top