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
New Cooper 6.5x284 LR
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="Greyfox" data-source="post: 1279855" data-attributes="member: 10291"><p>As you have seen, Retumbo loads with the 140gr bullets has been used with both Federal 210M and Federal 215 primers. I have done testing with both primers and been able to achieve good accuracy and ES with either primer. I have found that using the same charge of Retumbo(57gr), the Federal 215M's will produce 50-75 FPS greater velocity. This velocity can be matched by increasing the charge weight of Retumbo by .5-1.0gr and using the Federal 210M primer with no apparent difference in pressure with my rifles. I settled on using the higher charge of 58gr Retumbo with the 210M in my Cooper because my accuracy and ES values, while perfectly acceptable with the 215M, were better with the 210M and 58gr charge of Retumbo. As with seating depth, charge and primer selection can be specific to a particular rifle/barrel.</p><p>My Cooper is exceptionally accurate @2975FPS with single digit ES.</p><p></p><p>Left target-100 yards, right target 200 yards</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1279855, member: 10291"] As you have seen, Retumbo loads with the 140gr bullets has been used with both Federal 210M and Federal 215 primers. I have done testing with both primers and been able to achieve good accuracy and ES with either primer. I have found that using the same charge of Retumbo(57gr), the Federal 215M's will produce 50-75 FPS greater velocity. This velocity can be matched by increasing the charge weight of Retumbo by .5-1.0gr and using the Federal 210M primer with no apparent difference in pressure with my rifles. I settled on using the higher charge of 58gr Retumbo with the 210M in my Cooper because my accuracy and ES values, while perfectly acceptable with the 215M, were better with the 210M and 58gr charge of Retumbo. As with seating depth, charge and primer selection can be specific to a particular rifle/barrel. My Cooper is exceptionally accurate @2975FPS with single digit ES. Left target-100 yards, right target 200 yards [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New Cooper 6.5x284 LR
Top