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
Hunting
Long Range Hunting & Shooting
Flat shooting Elk gun?
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="Brent" data-source="post: 68389" data-attributes="member: 99"><p>Thanks Kirby.</p><p></p><p>The .257's BC of .820 is impressive but I wonder how accurate that number is? I know that the 300gr SMK's actual BC is higher than Sierra states, but it's not in the .8's though.</p><p></p><p>The 3200-3300 fps are numbers quoted many times by Darryl Cassel, as Matt27 said, in what I believe was a 36" K&amp;P barrel. He used WC872 as well. I'm not sure what OAL he used, as it would make a difference. </p><p></p><p>My brother gets a consistant 3000 fps with 118gr H870 in his 338/378 Wby using the 300gr SMK in a 32" Pac-Nor, his is throated for a 4.1" OAL though, so I'm sure 3100 is possible if your 338 Kahn is an improved version of the 338/378 Wby. </p><p></p><p>Darryl's 338/416 Rigby Imp. cases that he sent me held 138-140gr of water as I remember, but his case is formed so it has a .400 neck length, which is very long when compared to most other Imp. cartidges. Derrick's 338/378 Wby by comparison held 132gr water. </p><p></p><p>In comparison the 408 CT cases I checked held about 165gr water. </p><p></p><p>The 500 Jeffery was about 145gr water (that measurement is a bit foggy but close). I'll have to check a few again.</p><p></p><p>The .257 pill with the .820 BC, what length is it and what twist do use it in sucessfully?</p></blockquote><p></p>
[QUOTE="Brent, post: 68389, member: 99"] Thanks Kirby. The .257's BC of .820 is impressive but I wonder how accurate that number is? I know that the 300gr SMK's actual BC is higher than Sierra states, but it's not in the .8's though. The 3200-3300 fps are numbers quoted many times by Darryl Cassel, as Matt27 said, in what I believe was a 36" K&P barrel. He used WC872 as well. I'm not sure what OAL he used, as it would make a difference. My brother gets a consistant 3000 fps with 118gr H870 in his 338/378 Wby using the 300gr SMK in a 32" Pac-Nor, his is throated for a 4.1" OAL though, so I'm sure 3100 is possible if your 338 Kahn is an improved version of the 338/378 Wby. Darryl's 338/416 Rigby Imp. cases that he sent me held 138-140gr of water as I remember, but his case is formed so it has a .400 neck length, which is very long when compared to most other Imp. cartidges. Derrick's 338/378 Wby by comparison held 132gr water. In comparison the 408 CT cases I checked held about 165gr water. The 500 Jeffery was about 145gr water (that measurement is a bit foggy but close). I'll have to check a few again. The .257 pill with the .820 BC, what length is it and what twist do use it in sucessfully? [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
Flat shooting Elk gun?
Top