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
Weight sorted brass difference on charge wt and velocity
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: 2133252" data-attributes="member: 10755"><p>I'll give you an example of WHY case weight means very little.</p><p>I have Norma, Winchester & Remington cases in 300WM. Prior to sectioning them lengthwise, I weighed them, took actual CC measurement of case capacity and also noted case wall thickness, web thickness and taper.</p><p>The Norma weighed the least, held the most alcohol, had the thinnest web and the thickest walls near the case head and tapered the most.</p><p>The Remington weighed within 5gr of the Winchester, held less alcohol, had a thinner web by .015" and thicker walls than the Winchester and less taper.</p><p>The Winchester held more alcohol than Remington, had a very thick web and thinner walls with more taper.</p><p>The difference with the Norma could be ASSUMED to have more capacity just from weight alone, being some 35gr lighter.</p><p>It did, but not as much as weight alone would indicate because it had very thick case walls which reduces capacity.</p><p>The ASSUMPTION that the Remington and Winchester cases being similar in capacity would have been very wrong if case weight alone was taken as the indicator without measuring the actual capacity.</p><p>Many use the fill with water and weigh method before/after. True, this tells you how many grains of water it holds, but not an actual volume measurement.</p><p>I use a Burrette to measure in CC's, tells me exactly how much volume I have per case after I have prepped them, and I can assure you that some cases, even from the same lot do not have the same volume as the others. These cause flyers at 600 or beyond in my experience and case weight will NOT tell you this in every instance, as it may be a thicker wall on one side or other anomalies like eccentrically cut extractor grooves on some and not others.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2133252, member: 10755"] I’ll give you an example of WHY case weight means very little. I have Norma, Winchester & Remington cases in 300WM. Prior to sectioning them lengthwise, I weighed them, took actual CC measurement of case capacity and also noted case wall thickness, web thickness and taper. The Norma weighed the least, held the most alcohol, had the thinnest web and the thickest walls near the case head and tapered the most. The Remington weighed within 5gr of the Winchester, held less alcohol, had a thinner web by .015” and thicker walls than the Winchester and less taper. The Winchester held more alcohol than Remington, had a very thick web and thinner walls with more taper. The difference with the Norma could be ASSUMED to have more capacity just from weight alone, being some 35gr lighter. It did, but not as much as weight alone would indicate because it had very thick case walls which reduces capacity. The ASSUMPTION that the Remington and Winchester cases being similar in capacity would have been very wrong if case weight alone was taken as the indicator without measuring the actual capacity. Many use the fill with water and weigh method before/after. True, this tells you how many grains of water it holds, but not an actual volume measurement. I use a Burrette to measure in CC’s, tells me exactly how much volume I have per case after I have prepped them, and I can assure you that some cases, even from the same lot do not have the same volume as the others. These cause flyers at 600 or beyond in my experience and case weight will NOT tell you this in every instance, as it may be a thicker wall on one side or other anomalies like eccentrically cut extractor grooves on some and not others. Cheers. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Weight sorted brass difference on charge wt and velocity
Top