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
Nosler Ballistic Tip Jump
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="bigedp51" data-source="post: 1416070" data-attributes="member: 28965"><p><span style="font-size: 15px">Long range load development at 100 yards.</span></p><p><span style="font-size: 15px">By Erik Cortina </span></p><p><span style="font-size: 15px"><a href="http://forum.accurateshooter.com/threads/long-range-load-development-at-100-yards.3814361/" target="_blank">http://forum.accurateshooter.com/threads/long-range-load-development-at-100-yards.3814361/</a></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><strong>Some of you have asked for more detailed instructions on how I do this. Here they are:</strong></span></p><p><span style="font-size: 15px"><strong>1. Find Jam by seating a bullet long on a dummy piece of brass (no primer nor powder) and apply die wax to the bullet ogive and record it's base to ogive length. </strong></span></p><p><span style="font-size: 15px"><strong>2. Chamber the round and close the bolt. </strong></span></p><p><span style="font-size: 15px"><strong>3. Snap the bolt open and measure the base to ogive measurement. If it is shorter than previous measurement, this is your jam. Do it a few times with different cases to make sure.</strong></span></p><p><span style="font-size: 15px"><strong><span style="color: #ff0000">4. Load a known powder/primer/bullet combination. I load 4 of each powder charge in 0.5 gr. increments and seat bullets at jam - .020"</span>. I use one shot of each to get barrel fouled up and also keep an eye for max pressure at the same time. You can also use these rounds to break in a barrel if you are inclined to. If I encounter pressure on the hotter rounds, I will not shoot groups with the other loaded rounds and will pull bullets when I get back home. Do not shoot in round robin style because position and natural point of aim will be compromised.</strong></span></p><p><span style="font-size: 15px"><strong>5. Shoot 3 shot groups starting from lowest to highest. <strong>All groups are shot over a chronograph.</strong></strong></span></p><p><span style="font-size: 15px"><strong>6. Examine target and find the place where consecutive groups line up vertically and ES is the lowest and speed increases the least from one group to the next. </strong></span></p><p><span style="font-size: 15px"><span style="color: #ff0000"><strong>7. Load to the middle of the powder node and do a seating depth test.</strong></span></span></p><p><span style="font-size: 15px"><span style="color: #ff0000"><strong>8. Load 3 shot groups starting from Jam - 0.005" all the way out to Jam - .040" in .003" increments. </strong></span></span></p><p><span style="font-size: 15px"><strong>9. When you find the seating depth test that shoots the best, load towards the longest side of the node to allow more room for throat erosion.</strong></span></p><p><span style="font-size: 15px"><strong>10. Final step is to load the new seating depth and load 5 shot groups in 0.1 gr. increments 0.5 gr. on each side of node (if pressure limits are not reached). This will cover an entire grain of powder and you will be able to pinpoint where the powder node starts and ends. In the summer, load towards the low end of the node, and do the opposite in the winter. </strong></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><strong>HAPPY SHOOTING! </strong></span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1416070, member: 28965"] [SIZE=4]Long range load development at 100 yards. By Erik Cortina [URL]http://forum.accurateshooter.com/threads/long-range-load-development-at-100-yards.3814361/[/URL] [B]Some of you have asked for more detailed instructions on how I do this. Here they are:[/B] [B]1. Find Jam by seating a bullet long on a dummy piece of brass (no primer nor powder) and apply die wax to the bullet ogive and record it's base to ogive length. [/B] [B]2. Chamber the round and close the bolt. [/B] [B]3. Snap the bolt open and measure the base to ogive measurement. If it is shorter than previous measurement, this is your jam. Do it a few times with different cases to make sure.[/B] [B][COLOR=#ff0000]4. Load a known powder/primer/bullet combination. I load 4 of each powder charge in 0.5 gr. increments and seat bullets at jam - .020"[/COLOR]. I use one shot of each to get barrel fouled up and also keep an eye for max pressure at the same time. You can also use these rounds to break in a barrel if you are inclined to. If I encounter pressure on the hotter rounds, I will not shoot groups with the other loaded rounds and will pull bullets when I get back home. Do not shoot in round robin style because position and natural point of aim will be compromised.[/B] [B]5. Shoot 3 shot groups starting from lowest to highest. [B]All groups are shot over a chronograph.[/B][/B] [B]6. Examine target and find the place where consecutive groups line up vertically and ES is the lowest and speed increases the least from one group to the next. [/B] [COLOR=#ff0000][B]7. Load to the middle of the powder node and do a seating depth test.[/B] [B]8. Load 3 shot groups starting from Jam - 0.005" all the way out to Jam - .040" in .003" increments. [/B][/COLOR] [B]9. When you find the seating depth test that shoots the best, load towards the longest side of the node to allow more room for throat erosion.[/B] [B]10. Final step is to load the new seating depth and load 5 shot groups in 0.1 gr. increments 0.5 gr. on each side of node (if pressure limits are not reached). This will cover an entire grain of powder and you will be able to pinpoint where the powder node starts and ends. In the summer, load towards the low end of the node, and do the opposite in the winter. [/B] [B][/B] [B]HAPPY SHOOTING! [/B][/SIZE] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Nosler Ballistic Tip Jump
Top