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
Velocity inconsistent
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="Lefty7mmstw" data-source="post: 677642" data-attributes="member: 48043"><p>The news is out... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> velocity will vary a bit from shot to shot.....<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>A bit of variance is normal. You should try to stay away from 100 fps extreme deviation by a long shot, but a 20 fps or so x like you are talking about isn't that bad. Like the others have said, get the chrono back a few feet(15-20) and level, use diffusers or sky screens, and then you'll know what your real variation is. </p><p></p><p>Btw, 3263 fps average is 100 fps or more hot for an stw with a 168, if you drop your charge to a more reasonable level, your x's may come down some. At the least, you'll be saving bore and action life and getting more reloads out of your brass. General rule with an stw is 3400 with 140's, 3300 with 150's, 3150-3200 with 160's, and 3000 with 175's. Your 168 will be at 3100 fps at normal top pressure with a 24-26" barrel. I've worked with a bunch of these rifles, and none has been uniform well over pressure.</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 677642, member: 48043"] The news is out... :D velocity will vary a bit from shot to shot.....:D A bit of variance is normal. You should try to stay away from 100 fps extreme deviation by a long shot, but a 20 fps or so x like you are talking about isn't that bad. Like the others have said, get the chrono back a few feet(15-20) and level, use diffusers or sky screens, and then you'll know what your real variation is. Btw, 3263 fps average is 100 fps or more hot for an stw with a 168, if you drop your charge to a more reasonable level, your x's may come down some. At the least, you'll be saving bore and action life and getting more reloads out of your brass. General rule with an stw is 3400 with 140's, 3300 with 150's, 3150-3200 with 160's, and 3000 with 175's. Your 168 will be at 3100 fps at normal top pressure with a 24-26" barrel. I've worked with a bunch of these rifles, and none has been uniform well over pressure. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Velocity inconsistent
Top