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July 10th, 2017, 11:01 AM #21
Re: Looking for advice on buying a case trimmer.
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July 10th, 2017, 12:27 PM #22
Re: Looking for advice on buying a case trimmer.
Trimmers can index two ways, off the base (head), or off the shoulder. Most of the old style trimmers indexed off the base. Only in the past (maybe 5-7 years) have these new style trimmers that index off the shoulder have come out.
Not all shooters/re-loader's know what they are doing when it comes to reloading. If they set up their presses and dies correctly and trim using the shoulder as the index they will never have an issue with OAL. I've been doing it this way for all my AR's for about 7 years and well over 10K rounds now and never had a case jam or crush due to excessive OAL. I typically only trim once in the life of the case. I use a case gauge to determine if a spent case needs trimmed or not.
Case Gauge: https://www.amazon.com/Dillon-Precis.../dp/B0039OETOMLast edited by Hawk; July 10th, 2017 at 12:38 PM.
Toujours prêt
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July 10th, 2017, 04:02 PM #23Super Member
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Re: Looking for advice on buying a case trimmer.
The solution to your problem is easy and cheap. DON'T TRIM BRASS!! Trimming is a waste of time and the need to trim is usually related to bad resizing practice. While neck sizing is nice and I recommend it, when using semi-auto OR more than one firearm, full length and SAMMI dimensions must be retained. Case length has NOTHING to do with cartridge OAL or head space. Uniform case length may be required when crimping, otherwise the longer cases may be over crimped or otherwise deformed. SO STOP CRIMPING!! .223/5.56 do not need crimped. Stay away from AR15.COM and other sites where "experts" are posting. Good Luck!
Steve
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July 10th, 2017, 04:10 PM #24
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July 10th, 2017, 05:38 PM #25
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July 10th, 2017, 07:26 PM #26Grand Member
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Re: Looking for advice on buying a case trimmer.
Bottle necked rifle cartridges must be trimmed occasionally. Or the longer case will not chamber or the neck will jam the bullet in tight giving higher pressures. It will happen.
Most standard / low velocity pistol cartridges don't need trimming (at least thats what I do). They usually neck split or get lost before you have any problems clambering them
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July 10th, 2017, 07:27 PM #27Grand Member
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July 10th, 2017, 07:49 PM #28Senior Member
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Re: Looking for advice on buying a case trimmer.
Handloader Magazine covered this topic a few issues back. But, they were talking about straight-walled pistol brass. On that, they said no need to trim after the initial case length being checked.
Been reloading .223/5.56 ammo since the '70s, only check the case length about every 3 or 4 reloadings of the same brass. With a new batch, I check the case length and trim if needed (using old style hand trimmer). Crimping? No, I've tried it a few times and got inconsistent velocities and point of zero changes. If crimping, you need to ensure all your brass is 100% same length and same brand (wall thickness at neck), then ensure your crimping die is adjusted properly for that batch you are reloading. Too much hassle & headache for me.
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July 10th, 2017, 10:55 PM #29Super Member
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Re: Looking for advice on buying a case trimmer.
Tacgunner has hit the nail on the head in regards to crimping! As to the chance of overly long brass "self crimping" when the brass meets the rifling, shoot the rifle (after all we are talking about bottle necked cartridges, and not 7.62x25 or SIG Sauer 38's, so it must be a rifle) a 200 times and the rifling will move (BE moved) ahead enough so that the chance of that happening will disappear. For 5.56 or Wylde chambered rifles this is already taken in to consideration.
Steve
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July 11th, 2017, 07:08 AM #30Super Member
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