步枪复装不resize Lapua弹壳

Raymn

我有一支步枪，应该是膛比较紧, fire formed的Lapua弹壳不需要neck resize, 就可以再装弹头,且保持一定的neck retention。估计是Lapua brass 比较硬, springback的原因。我只在每打5次后用Redding Type-S die 把shoulder往后bump一下。这样用fire form代替neck resize有没弊端?

同一支枪, Winchester的弹壳比较薄且软, 就需要neck resize才能有neck retention。

FJC

如果不是定制枪膛可能还是不太靠谱，很紧的custom neck diameter枪膛，加上neck turn 弹壳，理论上没问题，纯理论，我自己没搞过

军火大a

可以，我这靶场有个打BR的老头就用的这种膛，就算打完neck还是能夹住头。

kelisuccess

去底火地同时不也得neck size吗? 难道去底火和neck size楼主是分2步进行地？

Raymn

kelisuccess 发表于 2016-11-17 11:40
去底火地同时不也得neck size吗? 难道去底火和neck size楼主是分2步进行地？

可以单用decapper.

Will

Lapua弹壳能用多少次？

Raymn

Will 发表于 2016-11-17 13:37
Lapua弹壳能用多少次？

只做neck sizing, trim,不装药过量的话20次没问题。直到底火装不紧开始松动。用hand primer会好些。

chevoodoo

第一次听说啊

Raymn

http://castboolits.gunloads.com/archive/index.php/t-220864.html

With a custom chambering reamer is made you can specify neck dia. the reamer cuts to. Normally this is a dimension that gives .001-.002 clearence on factory loaded ammo or sammi spec ammo. This is the no turn neck you refer to, the standard factory type chamber. On a custom reamer for benchrest or serious match shootig a Tight neck or turned neck throat is specified this is .005-.007 smaller than the loaded sammi diameter of the neck for the given cartridge, meaning necks have to be turned before being oaded to allow .0005-.001 clearance in the chamber. This is a means of keeping the loaded round on center and true to the bore of the rifle as possible. Brass done for a tight neck is normally dedicated to that rifle. Some benchrest shooters fit to chamber is such that there is no need to size cases as spring back is more than clearence is. Its a a way of gaining that last bit of accuracy available.

Raymn

case neck还是太紧，导致膛压过高，得ream一下里面，再turn一下外面。