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
Help! Extreme spread and standard deviation loads
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="918v" data-source="post: 1174973" data-attributes="member: 84964"><p>I achieved single digit ES by eliminating variables:</p><p></p><p>1. Sorting brass by headstamp into 1gr lots to maintain consistent case volume. Not sorting by weight typically results in a 1 to 2gr H2O capacity variance in the 308. </p><p></p><p>2. Sizing with appropriate dies to achieve a certain neck tension which results in similar bullet pull to new factory ammo. This means annealing is also required. Tip- if your seater die is mangling your bullet nose and your powder charge isn't compressed you are running too much neck tension and your ES will suffer. </p><p></p><p>3. Weighing powder on a scale accurate to one sixth of one kernel. </p><p></p><p>4. Finding the right jump length. </p><p></p><p>5. Matching the primer to the powder. Certain combinations work better than others. </p><p></p><p>6. Finding the correct powder charge. There are accuracy nodes and there are ES nodes and the two don't always coincide. Do you want a quarter-inch group with an ES of 30 FPS or a half-inch group with an ES of 10? Sometimes you adjust the powder charge and/or jump to compromise. </p><p></p><p>7. Testing in a dirty barrel. Squeaky clean barrels deliver poor ES. Seeing these people cleaning between groups makes me laugh. I dry brush to maintain a reasonable amount of carbon fouling in the bore. I seldom use solvent. Maybe once in a blue moon.</p></blockquote><p></p>
[QUOTE="918v, post: 1174973, member: 84964"] I achieved single digit ES by eliminating variables: 1. Sorting brass by headstamp into 1gr lots to maintain consistent case volume. Not sorting by weight typically results in a 1 to 2gr H2O capacity variance in the 308. 2. Sizing with appropriate dies to achieve a certain neck tension which results in similar bullet pull to new factory ammo. This means annealing is also required. Tip- if your seater die is mangling your bullet nose and your powder charge isn't compressed you are running too much neck tension and your ES will suffer. 3. Weighing powder on a scale accurate to one sixth of one kernel. 4. Finding the right jump length. 5. Matching the primer to the powder. Certain combinations work better than others. 6. Finding the correct powder charge. There are accuracy nodes and there are ES nodes and the two don't always coincide. Do you want a quarter-inch group with an ES of 30 FPS or a half-inch group with an ES of 10? Sometimes you adjust the powder charge and/or jump to compromise. 7. Testing in a dirty barrel. Squeaky clean barrels deliver poor ES. Seeing these people cleaning between groups makes me laugh. I dry brush to maintain a reasonable amount of carbon fouling in the bore. I seldom use solvent. Maybe once in a blue moon. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Help! Extreme spread and standard deviation loads
Top