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
257 weatherby 75 grain hammer findings
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="MagnumManiac" data-source="post: 2798617" data-attributes="member: 10755"><p>I can tell you why. The longer throat allows a gentle start pressure that rises slower than a standard throat. It also allows more powder for a higher velocity than a normal cartridge design allows.</p><p>This gentle transition to the rifling allows a better accuracy potential, contrary to what most believe, and allows a standard deviation that is very uniform…have seen this over the pressure trace with every Weatherby cartridge I have tested, which are the 270 Bee, 300 Bee, 340 Bee and 375 Bee. All but the 375 Bee have .376" throats while the 375 Bee has a custom match grade chamber running a .500" throat, in a 24" barrel, it gets over 3000fps with 250/260g pills, 2950fps with 270's and 2890fps with 300's, way faster than it should be and within max pressure limits. The accuracy is unbelievable, as a H&H, it was excellent anyway, but after re-chambering it shrunk the groups even more.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2798617, member: 10755"] I can tell you why. The longer throat allows a gentle start pressure that rises slower than a standard throat. It also allows more powder for a higher velocity than a normal cartridge design allows. This gentle transition to the rifling allows a better accuracy potential, contrary to what most believe, and allows a standard deviation that is very uniform…have seen this over the pressure trace with every Weatherby cartridge I have tested, which are the 270 Bee, 300 Bee, 340 Bee and 375 Bee. All but the 375 Bee have .376” throats while the 375 Bee has a custom match grade chamber running a .500” throat, in a 24” barrel, it gets over 3000fps with 250/260g pills, 2950fps with 270’s and 2890fps with 300’s, way faster than it should be and within max pressure limits. The accuracy is unbelievable, as a H&H, it was excellent anyway, but after re-chambering it shrunk the groups even more. Cheers. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
257 weatherby 75 grain hammer findings
Top