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
New brass - different velocities than fire formed?
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="Pdvdh" data-source="post: 990035" data-attributes="member: 4191"><p>Don,</p><p></p><p>I asked about the equipment you were measuring MV with, because some chronograph brands and models have better reputations than others. Now I'm not pooh poohing your chronograph just for personal enjoyment, but that chronograph doesn't have a stellar reputation for producing accurate and repeatable velocity measurements.</p><p></p><p>When I review your load #2 chronograph data and see an extreme spread (delta) of 238.7fps, and an SD of 102.8, I'm further convinced that your chronograph reported some bogus velocity data. I would totally dismiss the load 2 velocity data.</p><p></p><p>I wouldn't spend much time analyzing the rest of your velocity data in any detailed, serious manner, solely based on the model chronograph you're using. You also obtained a fairly large delta for load 3 (but nowhere near as extreme as load 2).</p><p></p><p>Beyond that, I will note that load 1 used WLRM primers and loads 2 & 3 used Fed 215M primers. Even if all other components, powder charges, and aspects of your loaded cartridges were identical, the use of different primers often yields different MVs. So that adds another variable, in addition to the use of the unfired and once fired Nosler cases. If you wanted to explore the affect that once fired cases versus virgin brass has on MV, you would really want to keep all other aspects of the loaded cartridges identical. Powder lots, seating depths, primers, powder charges, case and case neck preparation - everything else should be kept as constant as possible. </p><p></p><p>Hope you get your elk!</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 990035, member: 4191"] Don, I asked about the equipment you were measuring MV with, because some chronograph brands and models have better reputations than others. Now I'm not pooh poohing your chronograph just for personal enjoyment, but that chronograph doesn't have a stellar reputation for producing accurate and repeatable velocity measurements. When I review your load #2 chronograph data and see an extreme spread (delta) of 238.7fps, and an SD of 102.8, I'm further convinced that your chronograph reported some bogus velocity data. I would totally dismiss the load 2 velocity data. I wouldn't spend much time analyzing the rest of your velocity data in any detailed, serious manner, solely based on the model chronograph you're using. You also obtained a fairly large delta for load 3 (but nowhere near as extreme as load 2). Beyond that, I will note that load 1 used WLRM primers and loads 2 & 3 used Fed 215M primers. Even if all other components, powder charges, and aspects of your loaded cartridges were identical, the use of different primers often yields different MVs. So that adds another variable, in addition to the use of the unfired and once fired Nosler cases. If you wanted to explore the affect that once fired cases versus virgin brass has on MV, you would really want to keep all other aspects of the loaded cartridges identical. Powder lots, seating depths, primers, powder charges, case and case neck preparation - everything else should be kept as constant as possible. Hope you get your elk! [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
New brass - different velocities than fire formed?
Top