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Author Topic: .223 trimmed case length?  (Read 526 times)

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Offline JustShootin

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.223 trimmed case length?
« on: August 19, 2007, 03:05:10 AM »
I have several hundred pieces of .223 brass with a headstamp of LC. They measured from 1.730 to 1.735 and I have trimmed them to 1.730 without resizing. I do know the book length is 1.75. What effect will this condition have on reloading and shooting? Any input will be appreciated.
Thank You
Gramt
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Offline The Sodbuster

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Re: .223 trimmed case length?
« Reply #1 on: August 19, 2007, 03:17:16 AM »
I've shot .223 Remington brass that was marginally shorter (1.745" or thereabouts) without any problem.  What I'm wondering is, if all the brass was below spec', why trim it at all?  I'd suspect that unless you're a benchrest shooter, most of us couldn't tell any difference in accuracy or precision by using uniformly trimmed brass or not.

One more comment: full length resizing will frequently slightly lengthen brass.  I always trim after resizing.
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Offline JustShootin

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Re: .223 trimmed case length?
« Reply #2 on: August 19, 2007, 07:01:31 AM »
Thanks Sodbuster
I started with 450 cases and deprimed, swaged primer pockets, trimmed, and deburred. I wanted to have everything in this group the same. I will recheck length after resizing. What effects on loading or shooting will this condition have, plus or minus? I will be shooting them in a handirifle.
Thanks
Grant
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12ga 18 1/4" barrel = Bedroom gun,    12 w/rifled slug barrel,    .410,    12ga mod barrel only,    .22 Sportster,    .17 HMR Sportster,    .223 Rem,    .22 Hornet,    30/30,    45/70,    .357 Rem Max,    .50 Sidekick.

Offline beemanbeme

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Re: .223 trimmed case length?
« Reply #3 on: August 19, 2007, 07:14:16 AM »
What you've done will have little or no effect on reloading nor accuracy unless you're a bench shooter.
If you would like, you can seat your bullets as if the case was a nominal 1.75 and the combustion chamber would be the same. Only the bullet grip would be slightly less.
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Offline stimpylu32

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Re: .223 trimmed case length?
« Reply #4 on: August 19, 2007, 07:25:36 AM »
Grant

If your handi is like mine , it has a LOOOOONG throat so you will not be able to seat the bullets out as far to reduce the jump to the lands , other than that i see no reason why they woln't shoot just fine .

If you seat the bullets deep to get more neck tention stay below max loads as this will take away some of the case cap. , this is not a problem except with a powders that tend to fill the case to max cap.

stimpy 
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Offline JustShootin

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Re: .223 trimmed case length?
« Reply #5 on: August 20, 2007, 03:07:56 AM »
Thanks Guys
I am not a benchrest shooter, I just like to try to do it in an organized manner. I did full length resize 100 pieces and they grew .003-.005. The only problem with those is after finishing I had one of those "oh da__" thoughts because I didn't check the first couple in the gun. They are not flush with the chamber. Oh well. 450 is now 350 and in the end probably will be mixed.
Thanks again for the help.
Grant
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12ga 18 1/4" barrel = Bedroom gun,    12 w/rifled slug barrel,    .410,    12ga mod barrel only,    .22 Sportster,    .17 HMR Sportster,    .223 Rem,    .22 Hornet,    30/30,    45/70,    .357 Rem Max,    .50 Sidekick.

Offline LaOtto222

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Re: .223 trimmed case length?
« Reply #6 on: August 20, 2007, 12:10:03 PM »
A 223 and all bottle necked rimless cases head space on the shoulder. That is the critical dimension. Head space gages do not even have a neck. Neck length should have no effect other than those minor things mentioned above unless they are at extremes. This includes too long as well as too short. A too long neck will not release a bullet causing pressures to shoot way up because the neck does not have enough room to release the bullet. It would act as if the chamber neck was not reamed to the proper diameter. A very very short neck will not only reduce bullet friction, the octave on the bullet may not clear the neck area and scrape the shoulder of the neck relief before it reaches the throat. That would be disastrous to accuracy. Like I said these would be extreme conditions. The dimensions you are talking about are not even close to what I was explaining.
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