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7LRM (Long Range Magnum) - Pic & Info thread
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<blockquote data-quote="AZShooter" data-source="post: 1064915" data-attributes="member: 5219"><p>If you want to form your own then call Hornady and see what dies are necessary. Not sure but it might take a couple of steps to move the shoulder. </p><p></p><p>I had a box of 375 Ruger sitting around for several years. Every so often I would look at a piece and think of necking it down to 338 or 7mm. One day I decided to try and neck it down to 7mm with dies I had on hand. If it would work then I would order a reamer from PT&G.</p><p></p><p>The reason I finally went with the 7mm-375 Ruger was brass availability. When there was no other 7mm brass on the shelves ( a couple of years ago) there was always 375 Ruger at my local Sportsman's warehouse. </p><p></p><p>In my collection of dies I had the FL 338 RCM as well as a Whidden FL bushing die for same. The 338 RCM shares the same shoulder diameter and angle as the 375 Ruger. I did notice that you have to be careful using a bushing die as it often hangs up on the case mouth. I have often thought of grinding one side of the bushing with a taper to help things along. Here are the dies I used:</p><p></p><p>1) Hornady 338 RCM FL die</p><p>2) 300 RUM FL die to taper case mouth</p><p>3)7 RUM seater followed by 7 RUM FL die to continue reducing the neck dia</p><p>4) Whidden 338 RCM FL bushing die with .312 bushing</p><p>5) open up neck dia with K and M 7mm expand iron</p><p>6) turn necks to .013" wall thickness using K and M neck turning tool</p><p>7) use 338 RCM .309 bushing</p><p></p><p>I use a 375 Ruger FL die along with a small base die to size the fired cases. I made the small base die by cutting off the neck/shoulder and some of the base of the second 375 Ruger FL die. At this point I finally had to go buy some dies I didn't own...two 375 Ruger die sets. </p><p></p><p>For seating I used the 7mm-375 Ruger reamer and recut a Redding 7mm Rem mag comp die sleeve. </p><p></p><p>It was a fun exercise. </p><p></p><p>I used a Remington 7mm Rem mag takeoff that I rethread for a Ttang safety Ruger ith a lengthen mag box. Tried the 180s but the twist is marginal so moved to the 168 Berger classic hunter. Using 86 gr of RL-33 I am getting 3265 fps from a 26" barrel. </p><p></p><p>Enjoy the fun of doing it yourself. After reading this you may decide to make a full length 7mm-375 Ruger instead. </p><p></p><p>I am very happy with the performance</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1064915, member: 5219"] If you want to form your own then call Hornady and see what dies are necessary. Not sure but it might take a couple of steps to move the shoulder. I had a box of 375 Ruger sitting around for several years. Every so often I would look at a piece and think of necking it down to 338 or 7mm. One day I decided to try and neck it down to 7mm with dies I had on hand. If it would work then I would order a reamer from PT&G. The reason I finally went with the 7mm-375 Ruger was brass availability. When there was no other 7mm brass on the shelves ( a couple of years ago) there was always 375 Ruger at my local Sportsman's warehouse. In my collection of dies I had the FL 338 RCM as well as a Whidden FL bushing die for same. The 338 RCM shares the same shoulder diameter and angle as the 375 Ruger. I did notice that you have to be careful using a bushing die as it often hangs up on the case mouth. I have often thought of grinding one side of the bushing with a taper to help things along. Here are the dies I used: 1) Hornady 338 RCM FL die 2) 300 RUM FL die to taper case mouth 3)7 RUM seater followed by 7 RUM FL die to continue reducing the neck dia 4) Whidden 338 RCM FL bushing die with .312 bushing 5) open up neck dia with K and M 7mm expand iron 6) turn necks to .013" wall thickness using K and M neck turning tool 7) use 338 RCM .309 bushing I use a 375 Ruger FL die along with a small base die to size the fired cases. I made the small base die by cutting off the neck/shoulder and some of the base of the second 375 Ruger FL die. At this point I finally had to go buy some dies I didn't own...two 375 Ruger die sets. For seating I used the 7mm-375 Ruger reamer and recut a Redding 7mm Rem mag comp die sleeve. It was a fun exercise. I used a Remington 7mm Rem mag takeoff that I rethread for a Ttang safety Ruger ith a lengthen mag box. Tried the 180s but the twist is marginal so moved to the 168 Berger classic hunter. Using 86 gr of RL-33 I am getting 3265 fps from a 26" barrel. Enjoy the fun of doing it yourself. After reading this you may decide to make a full length 7mm-375 Ruger instead. I am very happy with the performance [/QUOTE]
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7LRM (Long Range Magnum) - Pic & Info thread
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