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
Virgin brass, or once fired!
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: 1907647" data-attributes="member: 10755"><p>I will give you my theory as to why virgin brass that has had all necessary prep shoots tighter groups over once, twice or thrice fired brass.</p><p>After running all my test loads over a pressure trace in conjunction with a chrony, there is a pattern that emerged.</p><p>Virgin brass not only produces lower pressure and velocity, but also a softer and longer start pressure. It is this fact, particularly with all belted cases, that they shoot very good groups. I believe it is this softer less violent transition into the rifling that causes the best groups. Just like a reduced load often does the same thing.</p><p>Now, this is only my theory after using the pressure trace for many years now. I'll give another example, my 25-06 is very destructive on animals I wish to eat, so I developed a reduced load hoping it would destroy less edible meat and, to my surprise this load shot into one hole that you could not distinguish there were in fact 5 shots into it...it was also totally repeatable. Now, admittedly, my 25-06 is a tack driver anyway, averaging 1/4-3/8 MoA groups depending on bullet weight, but this is still impressive with a reduced load. My 45-70 also did the same thing.</p><p></p><p>Hope this is as clear as mud.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1907647, member: 10755"] I will give you my theory as to why virgin brass that has had all necessary prep shoots tighter groups over once, twice or thrice fired brass. After running all my test loads over a pressure trace in conjunction with a chrony, there is a pattern that emerged. Virgin brass not only produces lower pressure and velocity, but also a softer and longer start pressure. It is this fact, particularly with all belted cases, that they shoot very good groups. I believe it is this softer less violent transition into the rifling that causes the best groups. Just like a reduced load often does the same thing. Now, this is only my theory after using the pressure trace for many years now. I’ll give another example, my 25-06 is very destructive on animals I wish to eat, so I developed a reduced load hoping it would destroy less edible meat and, to my surprise this load shot into one hole that you could not distinguish there were in fact 5 shots into it...it was also totally repeatable. Now, admittedly, my 25-06 is a tack driver anyway, averaging 1/4-3/8 MoA groups depending on bullet weight, but this is still impressive with a reduced load. My 45-70 also did the same thing. Hope this is as clear as mud. Cheers. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Virgin brass, or once fired!
Top