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
Rifles, Bullets, Barrels & Ballistics
Testing the 142 LR Accubond
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="BryanLitz" data-source="post: 1093752" data-attributes="member: 7848"><p>What's your barrel twist?</p><p></p><p>These 142 LRAB's are long, like 1.450". If your 6.5-284 is pushing around 2900 fps and the barrel is a 1:8.5" twist (guessing, I skimmed the post and didn't see a MV or twist) then you could be seeing 6% or more BC loss.</p><p></p><p>This is what I found with the other LRAB's, the BC's are good, but you might need more than conventional twist to get it all. Even at 2900 from an 8 twist, the 142 LRAB is just getting an SG of 1.5 in standard sea level conditions, less in winter.</p><p></p><p>Remember you can still get great groups (precision) with bullets that are flying with marginal stability and depressed BC's.</p><p></p><p>I've got these 142's in the que to test soon. I'll shoot them from the 1:6" twist just to be sure we're seeing all it's got to show us for testing purposes. If you have a 1:8.5" twist, you won't get all the BC from these bullets unless you're high up in altitude.</p><p></p><p>You can run the Berger stability calculator to see where your stability will fall: <a href="http://www.bergerbullets.com/twist-rate-calculator/" target="_blank">Twist Rate Stability Calculator | Berger Bullets</a></p><p></p><p>Take care,</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 1093752, member: 7848"] What's your barrel twist? These 142 LRAB's are long, like 1.450". If your 6.5-284 is pushing around 2900 fps and the barrel is a 1:8.5" twist (guessing, I skimmed the post and didn't see a MV or twist) then you could be seeing 6% or more BC loss. This is what I found with the other LRAB's, the BC's are good, but you might need more than conventional twist to get it all. Even at 2900 from an 8 twist, the 142 LRAB is just getting an SG of 1.5 in standard sea level conditions, less in winter. Remember you can still get great groups (precision) with bullets that are flying with marginal stability and depressed BC's. I've got these 142's in the que to test soon. I'll shoot them from the 1:6" twist just to be sure we're seeing all it's got to show us for testing purposes. If you have a 1:8.5" twist, you won't get all the BC from these bullets unless you're high up in altitude. You can run the Berger stability calculator to see where your stability will fall: [url=http://www.bergerbullets.com/twist-rate-calculator/]Twist Rate Stability Calculator | Berger Bullets[/url] Take care, -Bryan [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Testing the 142 LR Accubond
Top