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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone own a 7mm 300 Win Mag?
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<blockquote data-quote="Broz" data-source="post: 360621" data-attributes="member: 7503"><p>Nate I will do my best to give you accurate info here. But first I want to say I am not the origional owner/builder of the rifle. I do not have the reamer but I do have plans to aquire it. And I am working with WW brass that came with this rifle and it is in poor shape. I plan to work up some new brass before I go much further with this rifle. I feel it deserves it. Here goes.</p><p> </p><p>Fired case necks are .3165" loaded cases average .311" + or - .0005"</p><p> </p><p>Shoulder angle looks to be the standard 300 win. I can see no other changes that were made to the case.</p><p> </p><p>I started to have a bit of chambering issues (bit hard to close the bolt) and I was full sizing. So I looked into the length of the neck and found them to be extrememly long. Some as long as 2.656". So I trimmed them to a more standard 300 win length of 2.625" and the problem went away. This was the cases that shot into the same hole at 100 yds and into a 6" group at 1172 yrds.</p><p> </p><p>The rifle came with two sets of dies. A custom set of RCBS marked 7mm-300win. And a set marked the same of Lee collet dies. I did not like the Lee's because they left 4 ridges on the necks and after I fired them some cracked. So I switched to the RCBS dies. I have bushing ordered and will switch to my redding 300 win bushing dies soon.</p><p> </p><p>Seating depth. </p><p>The rifle has a long throat. I would assume they wanted a bit of free bore. "O" give with a 180 Berger on the lands is 3.060" I have tried different seating depths from on the lands to -.005" , -.010"and and then tried some at .020" shot of the mag box which is a "O" give of 2.952" All have shot good but much to my surprise the ones that are 2.952" or .108" off the lands are the ones from the last test and are shining. There also seems to be a bit less pressure there. I will see how it goes and if I need to seat closer will install a wyatts mag box with a .110" more room.</p><p> </p><p>I am shooting the hunting VLD with the J-4 jacket. My steel plate is just a piece of 1/2" steel, nothing hard for sure. But I am still amazed the 180's from this rifle were leaving noticeably deeper dents than a 210 VLD from a 300 win with the J-4 jacket also.</p><p> </p><p>Jeff</p></blockquote><p></p>
[QUOTE="Broz, post: 360621, member: 7503"] Nate I will do my best to give you accurate info here. But first I want to say I am not the origional owner/builder of the rifle. I do not have the reamer but I do have plans to aquire it. And I am working with WW brass that came with this rifle and it is in poor shape. I plan to work up some new brass before I go much further with this rifle. I feel it deserves it. Here goes. Fired case necks are .3165" loaded cases average .311" + or - .0005" Shoulder angle looks to be the standard 300 win. I can see no other changes that were made to the case. I started to have a bit of chambering issues (bit hard to close the bolt) and I was full sizing. So I looked into the length of the neck and found them to be extrememly long. Some as long as 2.656". So I trimmed them to a more standard 300 win length of 2.625" and the problem went away. This was the cases that shot into the same hole at 100 yds and into a 6" group at 1172 yrds. The rifle came with two sets of dies. A custom set of RCBS marked 7mm-300win. And a set marked the same of Lee collet dies. I did not like the Lee's because they left 4 ridges on the necks and after I fired them some cracked. So I switched to the RCBS dies. I have bushing ordered and will switch to my redding 300 win bushing dies soon. Seating depth. The rifle has a long throat. I would assume they wanted a bit of free bore. "O" give with a 180 Berger on the lands is 3.060" I have tried different seating depths from on the lands to -.005" , -.010"and and then tried some at .020" shot of the mag box which is a "O" give of 2.952" All have shot good but much to my surprise the ones that are 2.952" or .108" off the lands are the ones from the last test and are shining. There also seems to be a bit less pressure there. I will see how it goes and if I need to seat closer will install a wyatts mag box with a .110" more room. I am shooting the hunting VLD with the J-4 jacket. My steel plate is just a piece of 1/2" steel, nothing hard for sure. But I am still amazed the 180's from this rifle were leaving noticeably deeper dents than a 210 VLD from a 300 win with the J-4 jacket also. Jeff [/QUOTE]
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Anyone own a 7mm 300 Win Mag?
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