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
powder temperature sensitivity
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="goodgrouper" data-source="post: 210040" data-attributes="member: 2852"><p>I would also like to add that some powders show remarkable stability through a wide temperature range but then all of a sudden will go crazy when a certain temperature is reached. In my first 6ppc barrel of '07, it showed amazing accuracy with H322 when I first tinkered with it. THis was in January and I was working up loads at 10 degree temps. It was shooting in the "zeros" quite frequently and did so all winter and spring. Then when temps got to about 85 degrees just in time for our first local match, the powder went crazy and pressure spiked so bad that it was tough to hold a group under a .4" at 100 yards! I even dropped the charge down until I was getting speeds similar to the winter charges and it still wouldn't shoot well.</p><p></p><p>On the flip side of that coin, I had a lot of N133 that year that shot so so in the same barrel in the cold but never had groups go much under 1/4". I stoked up the charge to the point that it was hurting my brass and the groups got rounder but no smaller. I lowered the charge and the groups got vertical and larger. Then when the H322 went to pot in summer, I went back to the N133 and it kept shooting better and better the hotter it got. The velocities from winter to summer with the same load of N133 never were more than about 50 fps difference, but something about the warmer weather just brought out the best in N133.</p><p></p><p>A guy could spend a lifetime with a hundred powders and a thousand calibers and never figure all this stuff out!</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 210040, member: 2852"] I would also like to add that some powders show remarkable stability through a wide temperature range but then all of a sudden will go crazy when a certain temperature is reached. In my first 6ppc barrel of '07, it showed amazing accuracy with H322 when I first tinkered with it. THis was in January and I was working up loads at 10 degree temps. It was shooting in the "zeros" quite frequently and did so all winter and spring. Then when temps got to about 85 degrees just in time for our first local match, the powder went crazy and pressure spiked so bad that it was tough to hold a group under a .4" at 100 yards! I even dropped the charge down until I was getting speeds similar to the winter charges and it still wouldn't shoot well. On the flip side of that coin, I had a lot of N133 that year that shot so so in the same barrel in the cold but never had groups go much under 1/4". I stoked up the charge to the point that it was hurting my brass and the groups got rounder but no smaller. I lowered the charge and the groups got vertical and larger. Then when the H322 went to pot in summer, I went back to the N133 and it kept shooting better and better the hotter it got. The velocities from winter to summer with the same load of N133 never were more than about 50 fps difference, but something about the warmer weather just brought out the best in N133. A guy could spend a lifetime with a hundred powders and a thousand calibers and never figure all this stuff out! [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
powder temperature sensitivity
Top