准备复装357mag,没有SPM咋整？

冬天不冷226

请教坛子里的大佬一个问题。最近实在闲极无聊，想复装357mag。die的套装早就买好了，有500个158gr的弹头，有很多打过的弹壳，火药W231也有一些，就差底火了。目下状况基本上不可能找到SPM底火，有没有用SP底火的可能？家里有近万个SP，我的左轮枪是Ruger gp100的Match Champion，是可以打38special弹的。而38special的底火是SP的。


找了一个网上论坛的帖子，看到了一个算是有帮助的：
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I called to discuss the technical differences between their primer types. I was put in touch with one of their tech reps who was very happy to discuss their primers. She mentioned that she had worked there 38 yrs. I was asking about the cup thickness, formula differences, and formula amount differences between their #500 (SP), #550 (SPM), and #400 (SR). She had me hold a minute to get the detail specs up on her screen and this is what she said.

Cup thickness: The #500 has a thinner cup than either the #550 or #400, however, both the #550 and #400 have the same cup dimensions (including thickness) and material hardness.

Flash powder formula: All three sizes use the same formula for the flash powder.

Flash powder amount: The #500 has a slightly smaller amount (3 micrograms) than the #550 or #400 which both have the same amount.

I asked if the SR primers could be used as an acceptable substitute for the SPM primers. She compared the #550 and #400 and then replied that yes, they appeared to have the same specs, same dimensions, same cup thickness, same formula, and same amount of flash powder. She even noted that the SPM primers were slightly taller than the SP primers and were spec'd the same dimensions as the #400. I asked if she knew any reason not to just use SR primers for both magnum pistol and rifle applications based upon that information and she said that many there only bought rifle primers and used them for all their reloading, magnum or not. The only exception being for custom pistols where the thicker cup of the #550 and #400 contributed to misfires, which she said only occurred in custom race pistols with lightened springs.
当然，我还有不到两千个SR，差不多同样数量的弹头，不舍得用。
谢谢先！

爱枪的人

好复杂啊

停er

用231算是medium fast, primer差不了多少,SP vs SPM要到H110那些slow burning powder 才有分别。
如果說是357 Maximum (not magnum) 用Slow burning powder, 我就說有分别。

Within Min to max load, 放心用吧。如果不信自己chronograph 看看,分别小得很

赤影

357MAG的容量跟SP和SPM的爆炸区别比起来还是小，我认为没有问题，也是老枪友了，安全前提下实验一下就好了。

你是SPM到SP的downrun，最坏还能怎么样？我自己SR用光了，223都用SRM，我的发现是对精度和POI都没有影响。

skx779

我复装357mag和38spl，通用small pistol and和small pistol mag，两个基本没有什么太大区别，我主要用titegroup和h110, 两者的区别在357和38spl可以忽略，放心用。这又不是精射口径，底火只要可靠就没问题。

HappyOctopus

有近万个SP底火，LZ壕无人性。

冬天不冷226

停er 发表于 2020-11-23 06:33
用231算是medium fast, primer差不了多少,SP vs SPM要到H110那些slow burning powder 才有分别。
如果說是3 ...

谢谢，这才放心了。

冬天不冷226

赤影 发表于 2020-11-23 06:42
357MAG的容量跟SP和SPM的爆炸区别比起来还是小，我认为没有问题，也是老枪友了，安全前提下实验一下就好了 ...

谢谢老兄。

冬天不冷226

skx779 发表于 2020-11-23 07:10
我复装357mag和38spl，通用small pistol and和small pistol mag，两个基本没有什么太大区别，我主要用titeg ...

谢谢兄弟，可以放心了。

冬天不冷226

HappyOctopus 发表于 2020-11-23 09:53
有近万个SP底火，LZ壕无人性。

前几年一不留神搞多了。