July 11, 2018, 08:42 PM | #1 |
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Trimming Brass
I was online looking for RCBS shell holder chart and found a couple pdfs and some online ones. I found this one in particular that had the max length and the trim length.
https://op1.0ps.us/pdf/opplanet-rcbs...-chart-pdf.pdf Now I initially compared the calibers of interest to me to the Lyman 50th (30-06, .223, 9mm, and .380). Out of those 4, 30-06 and .223 had the same trim length in the pdf and book. For 9mm luger the case length are both at .754 where online trim length is .744 and in the book trim length is .751. The .380 both have same case length but the online trim length is .670 where the book trim length is .677. Now the pdf does not indicate source of information for verification if possible so this only makes me think to only follow what the book says. Is going below trim length from book a good/safe thing to do? Is there an acceptable tolerance of how much can be removed from what the book indicates? |
July 12, 2018, 01:39 AM | #2 | |
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Quote:
You do not want to trim below suggested trim length on cartridges that headspace off the case mouth like 9mm , 380 , 45acp , 40 S&W etc . When head spacing off the mouth of the case , It's the case length it self that determines the proper fit in the chamber . I'll look up what SAAMI says about the 380 EDIT : SAAMI minimum trim length for the 380 auto is .670 9mm - SAAMI minimum is .744 and max is .754 223 Rem - SAAMI minimum is 1.730 and max is 1.760 . I trim mine to 1.750 30-06 - SAAMI minimum 2.474 , max 2.494 . Seems splitting the difference is the norm so trim to 2.484
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July 12, 2018, 04:07 AM | #3 |
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Nino,
For the most part i use Lee case length gauges. Has a post set to length. For pistol cases380, 9mm, 45ACP i do not trim. Frankly not worth the time, as there is no shoulder for the pressure to push upon.
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July 12, 2018, 08:56 AM | #4 |
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Thanks for the info.
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July 12, 2018, 09:28 AM | #5 |
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You're wasting your time if you're looking to trim handgun brass. They are for the most part too short, not too long.
Don
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July 12, 2018, 11:28 PM | #6 |
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I haven't done any trimming of handgun brass. Being a beginner and seeing trim length on the book only naturally made me think that I did. Good thing I asked first. Thanks.
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July 13, 2018, 12:32 AM | #7 |
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Thanks for asking. Still new myself and trying to learn all that I can while I go. I read lots of posts that likely don’t apply to me, just to absorb any new tricks or tips that I may need later. I bought a nice case trimmer, but looks like I’ll just be mounting brushes and primer pocket cleaners...and there’s nothing wrong with that!
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July 13, 2018, 04:22 AM | #8 |
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While i do use the Lee case length gauges, old school on my rifle brass, i've been eyeballing the Lee Quick Trim. Trims, camfers and deburrs in one step. Issue is the need for a "trim die" ($5) for each different cartridge. Aka 250Savage, 257 Roberts etc..
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