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
Most brass too short. Trim them all?
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="JTB" data-source="post: 1390228" data-attributes="member: 97196"><p>entoptics</p><p>I agree with removing as many variables as possible and Mikecr has a good point that we can easily end up tail chasing when we attempt to improving something. A commonly recommended trim length for a 300 WM is 2.610 (0.01 under maximum) so if your shortest case is 2.606 you are pretty close and I wouldn't have a problem trimming to there. I know some report excessive throat erosion with overly shortenend cases but I don't know where that line is (I try to keep my case lengths at 0.01 under max when possible). I checked my new Norma 300 WM and they also measured at average approximately 2.606. I have tested several brass variances for their affect on accuracy. Of course this is not a scientific study but I tried to keep other variables constant. Case weight. I had some 7mm Weatherby brass with batches varying as much as 20 grains widening groups an additional 1.5 MOA. Neck tension. Tested annealed vs cases requiring unusually high seating pressure. Cases with necks tensions that are significantly varied caused about the same 1.5 MOA. Anneal as necessary. Case length has only caused me an issue when foulings were present in the throat as mentioned above. Was able to cut down on flyers by turning case necks. Too many possible variables (head space, sizing, concentricity, etc.) to list but the ones I have listed are easy to monitor and correct. I prefer to shoot from a bipod (normal hunting rig) and consistent 1/2 MOA groups are common. Hope this helps you shoot smaller.</p></blockquote><p></p>
[QUOTE="JTB, post: 1390228, member: 97196"] entoptics I agree with removing as many variables as possible and Mikecr has a good point that we can easily end up tail chasing when we attempt to improving something. A commonly recommended trim length for a 300 WM is 2.610 (0.01 under maximum) so if your shortest case is 2.606 you are pretty close and I wouldn’t have a problem trimming to there. I know some report excessive throat erosion with overly shortenend cases but I don’t know where that line is (I try to keep my case lengths at 0.01 under max when possible). I checked my new Norma 300 WM and they also measured at average approximately 2.606. I have tested several brass variances for their affect on accuracy. Of course this is not a scientific study but I tried to keep other variables constant. Case weight. I had some 7mm Weatherby brass with batches varying as much as 20 grains widening groups an additional 1.5 MOA. Neck tension. Tested annealed vs cases requiring unusually high seating pressure. Cases with necks tensions that are significantly varied caused about the same 1.5 MOA. Anneal as necessary. Case length has only caused me an issue when foulings were present in the throat as mentioned above. Was able to cut down on flyers by turning case necks. Too many possible variables (head space, sizing, concentricity, etc.) to list but the ones I have listed are easy to monitor and correct. I prefer to shoot from a bipod (normal hunting rig) and consistent 1/2 MOA groups are common. Hope this helps you shoot smaller. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Most brass too short. Trim them all?
Top