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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="Kiwi Nate" data-source="post: 903978" data-attributes="member: 8533"><p>Hi Guys, again I have not been following this thread all that much over the last couple of years so please excuse me if I cover the same old territory. </p><p></p><p>Several posts ago, a man asked about who he could get to do a basic rebarrel. Garou22 replied: "My Practical Is A 30 Inch Lilja 3 Groove Sendaro Contour Fluted With A Break" Then further on said: "Dave's 7Mm X 300 Win Mag Reamer Is Specifically Cut And Sized For..." He has mentioned two different cartridges in this post so I want to reset things straight for others coming in mid way into this length thread. Sorry garou22 if I have misunderstood your post in any way.</p><p></p><p>OK, first things first. The Mashburn is based on the .300 H&H, not the .300 Win Mag. The .300 Win Mag was not around when the Mashburn came along. Dimensions and forming processes are not the same as they are for the 7mm-300 WM or Practical. </p><p></p><p>Next- the 7mm Practical is not quite the same as the 7mm-300 Win Mag. Besides the steeper shoulder angle, when I designed the Practical, I found that the initial rifles could only be loaded a few times before the brass became tight with neck sizing, causing a need for custom FL dies which I wanted to avoid. So before I got any further ahead, I studied where the tight fit was occuring, then changed the dimensions and gave the Practical the shehane treatment, opening up the forward body dimensions / less taper. Providing the brass maintains a degree of spring back, this allows for continued neck sizing. This was my final 7mm Practical design. </p><p></p><p>The above being said, the body dimensions ( just behind the shoulder where the tight fit occurs) can easily be bumped with a .338 Win Mag or .300 Win Mag FL die if need be. The bottom of the case does not produce sticky extraction providing the basic guidelines for reaming are utilized, as given on our website. </p><p></p><p>The 7mm Practical is a no throat design, meaning that a separate throater is used to on each rifle. I designed the Practical this way so that the cartridge could be housed in long action rifles of various magazine lengths without having a negative effect on bullet jump. But there are limitations. The Howa / Weatherby Vanguard is the shortest long action the Practical can be housed in. The Ruger M77 for example, is too short. There are some folk who have asked PTG to create reamers with a specified lead rather than having their smith use a separate throat reamer as per my drawing. This can work out quite well providing the client does his math beforehand. </p><p></p><p>It pays to try and maintain a level of flexibility when selecting a preferred COAL so that if X bullet must be used in Lieu of Y bullet not being avaible due to supply problems, bullet jump or concentricity will not be a problem. The COAL's I have suggested for the Practical in a long magazine long action rifle are of this flexible nature. </p><p></p><p>The Practical is now used in New Zealand, U.S.A, Canada, New Caledonia and central Europe. There will soon be rifles in Australia and South Africa. The cartridge is employed for both long range hunting and competitive shooting. I am not sure whether I would want to use such a hot number for comp work but its nice to see the cartridge being put to use. I was hoping that many of the owners of 7mm Practical rifles would touch base with photos and such but alas, the Practical has grown very quickly in popularity and to some extent, taken on a life of its own. </p><p></p><p>Lastly, there are still folk concerned about basing a cartridge on a belted case design. In this instance, the belt is highly advantageous as it helps with one step fireforming. I have been able to shoot out to 1100 yards with FF loads in the Practical. However, for those who wish to use light fireforming loads, Trail Boss is the way to go. </p><p></p><p>Sorry to reiterate this stuff but there are probably guys like myself coming into this mid thread. </p><p></p><p>All the best guys and yes, that was a wonderful Buck. It is so important to pass hunting on to the next generation, even if such moments are brief. Great stuff.</p></blockquote><p></p>
[QUOTE="Kiwi Nate, post: 903978, member: 8533"] Hi Guys, again I have not been following this thread all that much over the last couple of years so please excuse me if I cover the same old territory. Several posts ago, a man asked about who he could get to do a basic rebarrel. Garou22 replied: "My Practical Is A 30 Inch Lilja 3 Groove Sendaro Contour Fluted With A Break" Then further on said: "Dave's 7Mm X 300 Win Mag Reamer Is Specifically Cut And Sized For..." He has mentioned two different cartridges in this post so I want to reset things straight for others coming in mid way into this length thread. Sorry garou22 if I have misunderstood your post in any way. OK, first things first. The Mashburn is based on the .300 H&H, not the .300 Win Mag. The .300 Win Mag was not around when the Mashburn came along. Dimensions and forming processes are not the same as they are for the 7mm-300 WM or Practical. Next- the 7mm Practical is not quite the same as the 7mm-300 Win Mag. Besides the steeper shoulder angle, when I designed the Practical, I found that the initial rifles could only be loaded a few times before the brass became tight with neck sizing, causing a need for custom FL dies which I wanted to avoid. So before I got any further ahead, I studied where the tight fit was occuring, then changed the dimensions and gave the Practical the shehane treatment, opening up the forward body dimensions / less taper. Providing the brass maintains a degree of spring back, this allows for continued neck sizing. This was my final 7mm Practical design. The above being said, the body dimensions ( just behind the shoulder where the tight fit occurs) can easily be bumped with a .338 Win Mag or .300 Win Mag FL die if need be. The bottom of the case does not produce sticky extraction providing the basic guidelines for reaming are utilized, as given on our website. The 7mm Practical is a no throat design, meaning that a separate throater is used to on each rifle. I designed the Practical this way so that the cartridge could be housed in long action rifles of various magazine lengths without having a negative effect on bullet jump. But there are limitations. The Howa / Weatherby Vanguard is the shortest long action the Practical can be housed in. The Ruger M77 for example, is too short. There are some folk who have asked PTG to create reamers with a specified lead rather than having their smith use a separate throat reamer as per my drawing. This can work out quite well providing the client does his math beforehand. It pays to try and maintain a level of flexibility when selecting a preferred COAL so that if X bullet must be used in Lieu of Y bullet not being avaible due to supply problems, bullet jump or concentricity will not be a problem. The COAL's I have suggested for the Practical in a long magazine long action rifle are of this flexible nature. The Practical is now used in New Zealand, U.S.A, Canada, New Caledonia and central Europe. There will soon be rifles in Australia and South Africa. The cartridge is employed for both long range hunting and competitive shooting. I am not sure whether I would want to use such a hot number for comp work but its nice to see the cartridge being put to use. I was hoping that many of the owners of 7mm Practical rifles would touch base with photos and such but alas, the Practical has grown very quickly in popularity and to some extent, taken on a life of its own. Lastly, there are still folk concerned about basing a cartridge on a belted case design. In this instance, the belt is highly advantageous as it helps with one step fireforming. I have been able to shoot out to 1100 yards with FF loads in the Practical. However, for those who wish to use light fireforming loads, Trail Boss is the way to go. Sorry to reiterate this stuff but there are probably guys like myself coming into this mid thread. All the best guys and yes, that was a wonderful Buck. It is so important to pass hunting on to the next generation, even if such moments are brief. Great stuff. [/QUOTE]
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