f*********n
发帖数: 11154 | 1 这个Federal Guard Dog是FMJ但是因为弹芯是polymer和铅组合，也能达到扩张的目的。
The new Federal Guard Dog ammunition is both full metal jacket and
expanding. How does the company do this? The front core of each bullet is
not lead but polymer. The pre-stressed jacket contains the polymer front
half and lead back-half core, and the lack of an opening provides a slick
feeding surface. On impact, the jacket begins to bend, as the polymer
section beneath it cannot support the impact load. The lead core continues
to drive the bullet forward, and the result is a bullet that expands.
弹头重量也比其他标准商业弹轻：
For example, in the 9mm, we have a 105-grain bullet that is longer than a
125-grain bullet. Were Federal to try to make it 125 grains in weight, it
would probably as long or longer than a 147-grain bullet, which would result
in stability problems. And the velocity might be so low—especially out of
compact carry—guns) that expansion would suffer.
In addition to the 105-grain 9mm there are 135-grain .40 S&W and 165-grain .
45 ACP offerings in the Guard Dog line.
http://www.handgunsmag.com/2012/01/06/review-federal-guard-dog- | h*********r
发帖数: 1943 | 2 这算是很久以前的旧闻，这种子弹我到手用了都快半年。
Fed从很多年前开始就有膨胀型的E（xpansion）FMJ，而且还是很大的产品线，除了我
之外这里应该还有其他人用过。 | f********t
发帖数: 4574 | 3 这个对于像有些1911那样，上空尖弹容易卡的枪是个福音
的。
【在 f*********n 的大作中提到】
: 这个Federal Guard Dog是FMJ但是因为弹芯是polymer和铅组合，也能达到扩张的目的。
: The new Federal Guard Dog ammunition is both full metal jacket and
: expanding. How does the company do this? The front core of each bullet is
: not lead but polymer. The pre-stressed jacket contains the polymer front
: half and lead back-half core, and the lack of an opening provides a slick
: feeding surface. On impact, the jacket begins to bend, as the polymer
: section beneath it cannot support the impact load. The lead core continues
: to drive the bullet forward, and the result is a bullet that expands.
: 弹头重量也比其他标准商业弹轻：
: For example, in the 9mm, we have a 105-grain bullet that is longer than a
| a***a
发帖数: 8941 | 4 I bought a box of 40SW a couple of months ago, but never shot it. |
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