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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm SAUM Wildcat!
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<blockquote data-quote="redneckclimbing" data-source="post: 613380" data-attributes="member: 41124"><p>Hey Everyone-</p><p> </p><p>I am going to build a long range hunting rifle in some sort of 7mm. I am set on compmnents: Lawton 7000 SA, 30" Kreiger 1-9 twist, AI stock. My dillemma comes with the 7SAUM and loading 180 Berger's long. (I want to use an AI stock and magazines and obviously they won't work this way.)</p><p>I had also noticed that a .284 Shehane will do basically the same velocities but is even a tad longer when loaded long. This got me thinking wildcat. My idea was to take the proportions of a 6mm Dasher and push them out to a SAUM case.</p><p>When I did these calcs. I found some interesting things: </p><p>- This gave me almost identical volumes to a .284 Shehane</p><p>- The start of the shoulder was only slightly shorter than a standard SAUM</p><p> </p><p>So, I thought why re-invent the wheel? Keep the lower (below the shoulder) part of the case the same, and put a 40' shoulder on it. With this combination it should have a slightly larger capacity than the Shehane but not much. This smaller volume should be more efficient than the SAUM or WSM. I am hoping that with about 56 grains of H4831sc it will consistently reach the 3000-3050 fps velocity node.</p><p> </p><p>Advantages:lightbulb</p><p> </p><p>- This will easily fit into an AI mag. with a 180 Berger loaded long</p><p>- with the 40' shsoulder I think that t will give slightly better vels. with similar charges as the Shehane</p><p>- With a similar powder load to the Shehane I was thinking that the barrell life should be similar (everything else being the same).</p><p> </p><p>I have drawn up a reamer for Mr. Kiff but am needing some suggestions on some things I didn't really know. (the question marks on the print) I was also wondering if someone could run this through QUICK LOAD and see what it spits out.</p><p> </p><p>I also have not had a chance to measure any bullets yet so if anyone knows the bearing surface lengths of some bullets and could post them that would be great so that I can finalize the freebore length. As you may notice this is basically a SAAMI chamber with a 40' shoulder and a slightly tighter neck.</p><p> </p><p>Please let me know what you think!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" />[ATTACH]6482[/ATTACH]</p><p> </p><p>Here is a copy of what I have so far.</p></blockquote><p></p>
[QUOTE="redneckclimbing, post: 613380, member: 41124"] Hey Everyone- I am going to build a long range hunting rifle in some sort of 7mm. I am set on compmnents: Lawton 7000 SA, 30" Kreiger 1-9 twist, AI stock. My dillemma comes with the 7SAUM and loading 180 Berger's long. (I want to use an AI stock and magazines and obviously they won't work this way.) I had also noticed that a .284 Shehane will do basically the same velocities but is even a tad longer when loaded long. This got me thinking wildcat. My idea was to take the proportions of a 6mm Dasher and push them out to a SAUM case. When I did these calcs. I found some interesting things: - This gave me almost identical volumes to a .284 Shehane - The start of the shoulder was only slightly shorter than a standard SAUM So, I thought why re-invent the wheel? Keep the lower (below the shoulder) part of the case the same, and put a 40' shoulder on it. With this combination it should have a slightly larger capacity than the Shehane but not much. This smaller volume should be more efficient than the SAUM or WSM. I am hoping that with about 56 grains of H4831sc it will consistently reach the 3000-3050 fps velocity node. Advantages:lightbulb - This will easily fit into an AI mag. with a 180 Berger loaded long - with the 40' shsoulder I think that t will give slightly better vels. with similar charges as the Shehane - With a similar powder load to the Shehane I was thinking that the barrell life should be similar (everything else being the same). I have drawn up a reamer for Mr. Kiff but am needing some suggestions on some things I didn't really know. (the question marks on the print) I was also wondering if someone could run this through QUICK LOAD and see what it spits out. I also have not had a chance to measure any bullets yet so if anyone knows the bearing surface lengths of some bullets and could post them that would be great so that I can finalize the freebore length. As you may notice this is basically a SAAMI chamber with a 40' shoulder and a slightly tighter neck. Please let me know what you think!:cool:[ATTACH]6482[/ATTACH] Here is a copy of what I have so far. [/QUOTE]
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7mm SAUM Wildcat!
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