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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm SAUM Wildcat!
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<blockquote data-quote="calinb" data-source="post: 640180" data-attributes="member: 31242"><p>While collecting parts for my 7mm (Win M70 LA, CDI bottom metal, 3 AI mags) I've been thinking about going in a different 7mm direction. I have a lifetime supply of 300 RCM brass to feed my 300 and 338 RCM Ruger M77s and it would be very easy to just neck the brass down to 7mm. Hornady is the sole brass supplier so sorting and uniforming the brass (neck annealing, turning, reaming) for consistency would probably be in order. On the upside, the brass is much cheaper than Nosler or Norma brass and I have plenty of it.</p><p></p><p>Quickload says a 7mm RCM would use a bit more powder than the GT or even the SAUM but predicts a 7mm RCM would launch 180 Bergers or the much more economical 162 AMAX even slightly faster than the SAUM. </p><p></p><p>Looking at the SAAMI prints, I think I could neck resize my 300 RCM brass down to 7mm with a Hornady 7mm neck size die and seat the bullet with a Hornady 7mm standard seating die. Shoulders could be pushed back and body sized with my Hornady 300 RCM full-length sizer, when necessary, but fired brass could also be used to order custom precision dies to match my 7mm RCM chamber.</p><p></p><p>I always use a full-length die to size necks down. Would a neck-only sizer work for this? I've been planning to order a custom chamber reamer from PTG anyway so this plan kind of makes sense to me.</p><p></p><p>I'm also on the fence about barrel length. Quickload says 26 inches only costs me 50 fps vs. 28 inches. If the 180 grain Bergers launch from a 28" barrel at 3050 fps, like QL predicts, I could probably afford to go 26 inches and still be good enough to get my toes wet in F-Class, while making for a better long-range hunting rig.</p><p></p><p>Thoughts and feedback appreciated!</p></blockquote><p></p>
[QUOTE="calinb, post: 640180, member: 31242"] While collecting parts for my 7mm (Win M70 LA, CDI bottom metal, 3 AI mags) I've been thinking about going in a different 7mm direction. I have a lifetime supply of 300 RCM brass to feed my 300 and 338 RCM Ruger M77s and it would be very easy to just neck the brass down to 7mm. Hornady is the sole brass supplier so sorting and uniforming the brass (neck annealing, turning, reaming) for consistency would probably be in order. On the upside, the brass is much cheaper than Nosler or Norma brass and I have plenty of it. Quickload says a 7mm RCM would use a bit more powder than the GT or even the SAUM but predicts a 7mm RCM would launch 180 Bergers or the much more economical 162 AMAX even slightly faster than the SAUM. Looking at the SAAMI prints, I think I could neck resize my 300 RCM brass down to 7mm with a Hornady 7mm neck size die and seat the bullet with a Hornady 7mm standard seating die. Shoulders could be pushed back and body sized with my Hornady 300 RCM full-length sizer, when necessary, but fired brass could also be used to order custom precision dies to match my 7mm RCM chamber. I always use a full-length die to size necks down. Would a neck-only sizer work for this? I've been planning to order a custom chamber reamer from PTG anyway so this plan kind of makes sense to me. I'm also on the fence about barrel length. Quickload says 26 inches only costs me 50 fps vs. 28 inches. If the 180 grain Bergers launch from a 28" barrel at 3050 fps, like QL predicts, I could probably afford to go 26 inches and still be good enough to get my toes wet in F-Class, while making for a better long-range hunting rig. Thoughts and feedback appreciated! [/QUOTE]
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7mm SAUM Wildcat!
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