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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
First Custom Rifle Concerns
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<blockquote data-quote="Brad7348" data-source="post: 2333494" data-attributes="member: 70334"><p>Posted some of this in another thread but thought it would apply here as well. </p><p></p><p>I run 180s on my 7SAUM on a short action. I use an extended mag, and its a custom Stiller action with the extended mag opening. I seat them fairly far out and have little to no issues. 25" barrel on my rig. </p><p></p><p>Seat depth:</p><p>168G Berger VLD Hunting – 2.25 to the Ogive</p><p>180G Berger VLD Hunting – 2.25 to Ogive</p><p></p><p>I'm loading about 15 thousandths off the lands.</p><p></p><p>With the 180s I get roughly 2870fps running Retumbo in the mid range of my ladder tests with no pressure signs depending on load. At that velocity I usually have a couple of shots touching and one about 1/2" out on a three shot group at 200 yards. So it is shooting well under 1/2 MOA. The only thing I have that shoots better is my 338 Lapua which will cloverleaf every time at 200 (If I'm steady), but its a long heavy barrel and on a heavy chassis.</p><p></p><p>7SAUM is a great choice. My only complaint is that it took a bit of tweaking to get it to feed well. Short fat cartridges with long VLD projectiles are a bit tricky to feed. Had to go center feed, two in the mag well and one in the chamber is all it will hold.</p><p></p><p>Maybe worth a read too - <a href="https://www.longrangehunting.com/threads/short-mag-build.283803/" target="_blank">https://www.longrangehunting.com/threads/short-mag-build.283803/</a></p></blockquote><p></p>
[QUOTE="Brad7348, post: 2333494, member: 70334"] Posted some of this in another thread but thought it would apply here as well. I run 180s on my 7SAUM on a short action. I use an extended mag, and its a custom Stiller action with the extended mag opening. I seat them fairly far out and have little to no issues. 25" barrel on my rig. Seat depth: 168G Berger VLD Hunting – 2.25 to the Ogive 180G Berger VLD Hunting – 2.25 to Ogive I'm loading about 15 thousandths off the lands. With the 180s I get roughly 2870fps running Retumbo in the mid range of my ladder tests with no pressure signs depending on load. At that velocity I usually have a couple of shots touching and one about 1/2" out on a three shot group at 200 yards. So it is shooting well under 1/2 MOA. The only thing I have that shoots better is my 338 Lapua which will cloverleaf every time at 200 (If I'm steady), but its a long heavy barrel and on a heavy chassis. 7SAUM is a great choice. My only complaint is that it took a bit of tweaking to get it to feed well. Short fat cartridges with long VLD projectiles are a bit tricky to feed. Had to go center feed, two in the mag well and one in the chamber is all it will hold. Maybe worth a read too - [URL]https://www.longrangehunting.com/threads/short-mag-build.283803/[/URL] [/QUOTE]
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First Custom Rifle Concerns
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