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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm RUM Re-barrel Options?
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<blockquote data-quote="Kiwi Nate" data-source="post: 366892" data-attributes="member: 8533"><p>I am in the same boat with my RUM, using it too much. I would like to go to the simple wildcat 7mm-300 win mag. Velocities are actually pretty much the same as my RUM simply because you can only push things so far with the 7mm bore till the gains get smaller with huge steps up in powder. I stand to lose about 100 to 130fps with 180 grain bullets from the step down which isn't too bad. The 162 grain bullets will lose 25-50fps from what I am getting now which is nothing.</p><p> </p><p>I would like to use the existing neck/shoulder juntion of the .300 Win mag case as an unchaged reference point, utilize the belt for fireforming which actually gives the belt a purpose, blow the shoulder forwards slightly but not enough to arrest case growth, reduce the body taper and let the case neck grow a tad (no trimming for a while). No special dies, just use a standard 7mm neck die, neck the .300 brass down to 7mm and shoot. The fireforming loads should be accurate out to 400 yards or so, perhaps out to all ranges, will have to have a play when I get it all done. Having said all of this, the same can be achieved with a long barreled 7mm Rem mag. Its just a case of how you want to go about things.</p></blockquote><p></p>
[QUOTE="Kiwi Nate, post: 366892, member: 8533"] I am in the same boat with my RUM, using it too much. I would like to go to the simple wildcat 7mm-300 win mag. Velocities are actually pretty much the same as my RUM simply because you can only push things so far with the 7mm bore till the gains get smaller with huge steps up in powder. I stand to lose about 100 to 130fps with 180 grain bullets from the step down which isn't too bad. The 162 grain bullets will lose 25-50fps from what I am getting now which is nothing. I would like to use the existing neck/shoulder juntion of the .300 Win mag case as an unchaged reference point, utilize the belt for fireforming which actually gives the belt a purpose, blow the shoulder forwards slightly but not enough to arrest case growth, reduce the body taper and let the case neck grow a tad (no trimming for a while). No special dies, just use a standard 7mm neck die, neck the .300 brass down to 7mm and shoot. The fireforming loads should be accurate out to 400 yards or so, perhaps out to all ranges, will have to have a play when I get it all done. Having said all of this, the same can be achieved with a long barreled 7mm Rem mag. Its just a case of how you want to go about things. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm RUM Re-barrel Options?
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