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
Anyone own a 7mm 300 Win Mag?
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="Kiwi Nate" data-source="post: 762077" data-attributes="member: 8533"><p>Hi guys, please excuse my metric and mixed units.</p><p></p><p>I built a 7mm-300 (7mm Practical) on a Howa last year for a client. The magazine box is 91mm but for smooth feeding from the mag, max COAL needs to be no more than 90.2mm. Divide by 25.4 for imperial. </p><p></p><p>OK, so I took a gamble with the above and we set the rifle up for a max COAL (touching the lands) of 91.2mm, then seated the A-Max to 90.2mm for 1mm (40 thou) jump. It worked and the rifle shot well. Pet load was 3215fps from a 26" barrel. </p><p></p><p>I chose the 40 thou jump because if I had gone any shorter, the client would never be able to use a conventional soft point or SST bullets. I wanted the client to be able to use the Partition if need be. As it is, these bullet designs are at a point where the ogive is in or up against the case mouth. </p><p></p><p>There is not a great deal of difference between the max COAL of the A-Max versus the max COAL of the Berger- Berger tend to run about 20 thou longer.</p><p></p><p>I have to admit that I do prefer to work with a longer mag box. 92mm is a good minimum (3.622).</p><p></p><p>As for new generation heavy 7mm bullets, I have been playing with the 190gr Matrix in my rifle, video and autopsies here if anyone wants a look:</p><p></p><p>[media=youtube]h7lkaRRihUs[/media]</p></blockquote><p></p>
[QUOTE="Kiwi Nate, post: 762077, member: 8533"] Hi guys, please excuse my metric and mixed units. I built a 7mm-300 (7mm Practical) on a Howa last year for a client. The magazine box is 91mm but for smooth feeding from the mag, max COAL needs to be no more than 90.2mm. Divide by 25.4 for imperial. OK, so I took a gamble with the above and we set the rifle up for a max COAL (touching the lands) of 91.2mm, then seated the A-Max to 90.2mm for 1mm (40 thou) jump. It worked and the rifle shot well. Pet load was 3215fps from a 26" barrel. I chose the 40 thou jump because if I had gone any shorter, the client would never be able to use a conventional soft point or SST bullets. I wanted the client to be able to use the Partition if need be. As it is, these bullet designs are at a point where the ogive is in or up against the case mouth. There is not a great deal of difference between the max COAL of the A-Max versus the max COAL of the Berger- Berger tend to run about 20 thou longer. I have to admit that I do prefer to work with a longer mag box. 92mm is a good minimum (3.622). As for new generation heavy 7mm bullets, I have been playing with the 190gr Matrix in my rifle, video and autopsies here if anyone wants a look: [media=youtube]h7lkaRRihUs[/media] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone own a 7mm 300 Win Mag?
Top