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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Calibre choice for hunting
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<blockquote data-quote="MudRunner2005" data-source="post: 1193318" data-attributes="member: 12995"><p>If you went with a straight 7mm-300 WinMag, it would be a very simple 1-step necking-down process to make brass for it. You would take brand new .300WM brass and run them through the 7mm-300 WinMag full-length sizer die, and then when you shoot them the first time, it will form the cases to your chamber. And then you have fully-formed 7mm-300 WinMag brass.</p><p></p><p>With the right powder and bullet combo, 10 grains of powder can make for a decent velocity increase.</p><p></p><p>7mm-300WM is only 7 grains of powder over 7mm RemMag.</p><p></p><p>7mm-300WM Improved 40* with a .010" wall taper will get you 10.2 grains increase over 7mm RemMag.</p><p></p><p>Now, if you compare a straight 7mm RemMag with an equal weight-for-caliber bullet to a straight .300 WinMag with an equal weight-for-caliber bullet, you get nearly a ballistic tie across the board despite the powder capacity increase. Because the added weight and diameter of the heavier and larger .30 caliber bullet eats the difference in the larger powder charge weight for the .300WM bringing to a nearly level plane with the 7mm RemMag with it's lighter and smaller diameter bullet.</p></blockquote><p></p>
[QUOTE="MudRunner2005, post: 1193318, member: 12995"] If you went with a straight 7mm-300 WinMag, it would be a very simple 1-step necking-down process to make brass for it. You would take brand new .300WM brass and run them through the 7mm-300 WinMag full-length sizer die, and then when you shoot them the first time, it will form the cases to your chamber. And then you have fully-formed 7mm-300 WinMag brass. With the right powder and bullet combo, 10 grains of powder can make for a decent velocity increase. 7mm-300WM is only 7 grains of powder over 7mm RemMag. 7mm-300WM Improved 40* with a .010" wall taper will get you 10.2 grains increase over 7mm RemMag. Now, if you compare a straight 7mm RemMag with an equal weight-for-caliber bullet to a straight .300 WinMag with an equal weight-for-caliber bullet, you get nearly a ballistic tie across the board despite the powder capacity increase. Because the added weight and diameter of the heavier and larger .30 caliber bullet eats the difference in the larger powder charge weight for the .300WM bringing to a nearly level plane with the 7mm RemMag with it's lighter and smaller diameter bullet. [/QUOTE]
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