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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7LRM vs. 7-375
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<blockquote data-quote="AZShooter" data-source="post: 916059" data-attributes="member: 5219"><p>If you buy the 7 LRM reamer that will be your only major expense. If you want to neck down the 375 case it will take several steps and dies to do so. </p><p></p><p>I had a box of 375 Ruger brass ever since it first hit the shelves many years ago. I thought it would make a dandy 338, 300 or 7mm. Finally decided to see if I could neck the brass down to 7mm with dies I had on hand. If I couldn't do it successfully with my dies then I wouldn't bother. </p><p></p><p>Necking down to 338 dia is easy. I had a 338 RCM Hornady FL die set plus a Whidden Bushing/FL sizer for my 338 RCM. The 375 Ruger and both RCMs share the same shoulder diameter and angle. </p><p></p><p>Steps in reducing the neck to 7mm:</p><p></p><p>1)338 RCM seater die </p><p>2) 338 FL die. </p><p>3) 300 RUM FL die to taper mouth of case </p><p>4)7 RUM seater die followed by FL to reduce neck dia </p><p> 5) Whidden 338 RCM bushing die with .312 bushing</p><p>6) Open up with K and N mandrel, neck turn to .0135" neck wall thickness</p><p>7) Run brass into Whidden 338 RCM bushing die with .310/309 bushing for finalized neck tension</p><p> </p><p>I was fortunate to have the whidden bushing die.</p><p></p><p>I am still using the whidden bushing die for neck sizing. Purchased a 375 Ruger die set and use the FL die for sizing the body and shoulder. </p><p></p><p>As you can see there is significant work to be done to get the brass formed to 7mm. It was a fun challenge. Once the formed brass was made I sent one to Dave Kiff and he made me the reamer. </p><p></p><p>The availability of brass is one of the perks of making the 7mm/375. </p><p></p><p>If I were to do this today I would just buy the 7 LRM reamer, Hornady's die set and Gunwerk's brass.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 916059, member: 5219"] If you buy the 7 LRM reamer that will be your only major expense. If you want to neck down the 375 case it will take several steps and dies to do so. I had a box of 375 Ruger brass ever since it first hit the shelves many years ago. I thought it would make a dandy 338, 300 or 7mm. Finally decided to see if I could neck the brass down to 7mm with dies I had on hand. If I couldn't do it successfully with my dies then I wouldn't bother. Necking down to 338 dia is easy. I had a 338 RCM Hornady FL die set plus a Whidden Bushing/FL sizer for my 338 RCM. The 375 Ruger and both RCMs share the same shoulder diameter and angle. Steps in reducing the neck to 7mm: 1)338 RCM seater die 2) 338 FL die. 3) 300 RUM FL die to taper mouth of case 4)7 RUM seater die followed by FL to reduce neck dia 5) Whidden 338 RCM bushing die with .312 bushing 6) Open up with K and N mandrel, neck turn to .0135” neck wall thickness 7) Run brass into Whidden 338 RCM bushing die with .310/309 bushing for finalized neck tension I was fortunate to have the whidden bushing die. I am still using the whidden bushing die for neck sizing. Purchased a 375 Ruger die set and use the FL die for sizing the body and shoulder. As you can see there is significant work to be done to get the brass formed to 7mm. It was a fun challenge. Once the formed brass was made I sent one to Dave Kiff and he made me the reamer. The availability of brass is one of the perks of making the 7mm/375. If I were to do this today I would just buy the 7 LRM reamer, Hornady's die set and Gunwerk's brass. [/QUOTE]
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7LRM vs. 7-375
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