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回帖奖励 +10 子弹
据说magnum对膛压的影响比较大,对速度(能量)的影响相对小。
引用一个搜到的数据,同样条件对比CCI 250和200,膛压高了12%,速度只高了0.9%(子弹动能高了1.8%)
遗憾的是,一般普通人好像没有自己测量膛压的条件。
http://www.thehighroad.org/archive/index.php/t-534410.html
Handloader Magazine published an article by A-Square where they tested different primers with a load in the 7MM ReMag.
160 grain Sierra boat-tail, 66.0 grains of Hodgdon H-4831 and Winchester cases.
Winchester WLRM (magnum)¬___ 3045 fps, 67,600 psi
Winchester WLR (standard) ____ 3024 fps, 64,400 psi
Federal 215 (magnum)________ 3036 fps, 61,400 psi
CCI 250 (magnum)___________ 3039 fps, 61,500 psi
Remington 9½ M (magnum)____ 3041 fps, 59,300 psi
CCI 200 (standard)___________ 3011 fps, 54,800 psi
The SAAMI max pressure for the 7MM ReMag is 64,000psi.
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