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Joined: Nov 2005
Posts: 2,285
Campfire Regular
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OP
Campfire Regular
Joined: Nov 2005
Posts: 2,285 |
257 Roberts cases. Max length 2.233; trim-to length: 2.223.
I have a bunch of cases that are over max, but they chamber. My question is, I've trimmed 20 cases back to 2.213 vs 2.223. Any problem trimming back .010 or .020 under minimum of .223
Ed
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Joined: May 2011
Posts: 15,875
Campfire Ranger
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Campfire Ranger
Joined: May 2011
Posts: 15,875 |
I've done the same thing and have wondered how it would affect things.
There are 2 rules to success:
1. Never tell everything that you know.
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Joined: Jun 2005
Posts: 2,195
Campfire Regular
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Campfire Regular
Joined: Jun 2005
Posts: 2,195 |
Should be no issue. Nosler .308 brass I use is usually short right out of the bag. For knowing what max is, there is a tool you can get, of course I don't remember the details, that measures what is the brass length actual max is for your chamber.
Ride well, shoot straight, and speak the truth.
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Joined: Feb 2010
Posts: 17,792
Campfire Ranger
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Campfire Ranger
Joined: Feb 2010
Posts: 17,792 |
The important factor in trimming cases is that they're all uniform length, while trimming to the "trim to" length is preferred .010 - .020" shorter is no big deal. Next time you have your dial/digital calipers out set them to .010" and .020" and you'll gain an understanding for how miniscule these measurements really are.
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Joined: Sep 2006
Posts: 2,087
Campfire Regular
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Campfire Regular
Joined: Sep 2006
Posts: 2,087 |
So long as they are under trim length I've never had a problem. I've had lots of case'e where the length varied a thousandth or two and it was no problem. I suppose that in a case headspaceing on the neck it could be a problem. I was reading yesterday that .004 is about the thickness of a human hair, it isn't gonna matter other than there a hair difference in how much neck is holding the bullet! I really believe if people put the effort into learning to shoot well that they do in trying to become ballistic specialist, they'd be much better off! I think a good example of that is how many thousand's people want to be off the lands. It may make a small difference on a paper target but it won't on a live target!
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Joined: Jul 2009
Posts: 1,476
Campfire Regular
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Campfire Regular
Joined: Jul 2009
Posts: 1,476 |
The chamber in the your gun is the important issue . A max factory chamber vs a tight custom chamber could be very different .
As I understand it over max brass length can form a crimp on the bullet and increase pressure.
A chamber cast of your gun chamber will tell you what your max length is. Use cerrosafe or melted candle wax in a chamber sprayed with silicone. Be sure and put a wad of
cloth or a cleaning patch at the point just beyond the chamber. When the cast is cooled push it out with a rod from the muzzle.
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Joined: Dec 2019
Posts: 79
Campfire Greenhorn
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Campfire Greenhorn
Joined: Dec 2019
Posts: 79 |
I regularly trim .223 brass short. That way I only have to do it once in the life of the brass. Doesn’t hurt a thing.
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Joined: Nov 2005
Posts: 2,285
Campfire Regular
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OP
Campfire Regular
Joined: Nov 2005
Posts: 2,285 |
Good to know, thanks everyone.
Ed
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Joined: Nov 2007
Posts: 239
Campfire Member
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Campfire Member
Joined: Nov 2007
Posts: 239 |
If crimping bullets, it is important for cases to all be the same length.
Man and man's best friend still looking at the green side of sod.
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Joined: Jul 2012
Posts: 643
Campfire Regular
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Campfire Regular
Joined: Jul 2012
Posts: 643 |
had a co-worker that was loading 7mm mag. in a discussion about what we used when trimming cases, he replied he had never trimmed ANY cases! he is now educated on the subject.
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Joined: May 2002
Posts: 9,525
Campfire Outfitter
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Campfire Outfitter
Joined: May 2002
Posts: 9,525 |
I use this: Giraud tri-way. Trims, chamfers, deburs. If you don't have one, all you'll need is a drill.
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Joined: Apr 2011
Posts: 151,114
Campfire Savant
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Campfire Savant
Joined: Apr 2011
Posts: 151,114 |
I regularly trim .223 brass short. That way I only have to do it once in the life of the brass. Doesn’t hurt a thing. I do that also. 223’s are the only cartridge I trim for.
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