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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
short mag build
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<blockquote data-quote="Brad7348" data-source="post: 2328959" data-attributes="member: 70334"><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. Here are the specs on my rifle. It is up there with the most accurate rifle I own. </p><p></p><p>Stiller Predator SA</p><p>Hand Lapped - MullerWorks #4 precision 7mm barrel – 1 – 8.7 twist – Fluted with Muscle Brake contoured to barrel – finished 25 inches – chambered 7mmSAUM </p><p>H-S Precision 2000 series light weight stock</p><p>Jewel trigger set at 1.5#</p><p>March F FFP 2.5-25X42 scope with fine MOA reticle</p><p>I believe total weight was around 8.5 lbs when I built it.</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>Recoil is next to nothing with the brake on. Probably not much more than my light weight 6.5 creed. I don't really notice a lot of difference without the brake. The front end may jump a bit more but its not hard on the shoulder at all.</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></blockquote><p></p>
[QUOTE="Brad7348, post: 2328959, member: 70334"] 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. Here are the specs on my rifle. It is up there with the most accurate rifle I own. Stiller Predator SA Hand Lapped - MullerWorks #4 precision 7mm barrel – 1 – 8.7 twist – Fluted with Muscle Brake contoured to barrel – finished 25 inches – chambered 7mmSAUM H-S Precision 2000 series light weight stock Jewel trigger set at 1.5# March F FFP 2.5-25X42 scope with fine MOA reticle I believe total weight was around 8.5 lbs when I built it. 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. Recoil is next to nothing with the brake on. Probably not much more than my light weight 6.5 creed. I don't really notice a lot of difference without the brake. The front end may jump a bit more but its not hard on the shoulder at all. 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. [/QUOTE]
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