Trimming .223 brass


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RM
December 17, 2009, 06:26 PM
Getting my Possum Hollow Trimmer set up. Just to confirm what I've been reading on this Forum about trimming .223 brass:
1.760" is the maximum length
1.740" is the minimum length
Trim the longer brass to 1.750"

Does all that sound correct?
What do I do with any brass shorter than 1.740" in length? Does that go in the scrap brass pile? Thank you.

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rcmodel
December 17, 2009, 06:43 PM
+1

Shorter will not hurt a thing if you are not crimping in a conventional seating/crimping die.

In that case, it is far more importent they are all exactly the same length, whatever that is.
And they are all less then 1.760" Max length.

rc

Deavis
December 17, 2009, 11:13 PM
I find that 1.745 trims or at least kisses the neck on 98% of all brass 223 I've trimmed. 1.750 misses about 6% more (including partial trims for mouths that aren't square)

mongoose33
December 18, 2009, 08:46 AM
I'm trimming to 1.74 w/ the Possum Hollow trimmer because I'm using the RCBS X-Die.

After firing and resizing, I even found a few that had dropped in length to 1.735.

I called RCBS to inquire; they said it was normal as some brass is more or less likely to spring back, and to just shoot 'em.

RC's observation has proven correct in my case; I just shoot 'em and they work fine.

RM
December 18, 2009, 10:39 PM
After trimming with the Possum Hollow Trimmer, the rounds are about 1.750", plus or minus about .006 inch. I assume the cartridge lengths differ some, because the trimmer headspaces on the shoulder rather than the OAL of the cartridge?

nicholst55
December 18, 2009, 11:07 PM
Did you size the brass before you trimmed it? That is the only way to fly; size, then trim. This makes all your brass effectively the same size from head to shoulder. If you have a .006" variation in case length after trimming, something is wrong. Either your technique needs work, or something else is badly wrong.

RM
December 19, 2009, 10:58 AM
Thank you. Brass is already sized, so I will recheck my trimming process.

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