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Trim to length .223

I have some Speer .223 brass that I want to use for 55 fmjs. The resized lenght varies between 1.740 to 1.759. I should mention this was fired out of LEOs M4s.

I'm thinking of just trimming long ones to 1.750 and leaving the shorter ones as is.
Now I want to get the best group I can using H335 out of a carbine but does a difference of .010 between 1.740 and 1.750 gonna make a much of a difference accuracy wise? Yeah it's just plinking ammo but I'd like to get as good a group as I can to 200 yards.

My other option is to separate cases according to lenght but I got over 1000 cases and don't look forward to checking each one.

Ideas? Thanks for looking.
 
For your purposes, in my opinion the only issue regarding case length that I'd be focused on is making sure the cases do not exceed the maximum for your rifle's chamber.

A few years ago, I purchased a Sinclair chamber length gauge which enabled me to measure the length of my rifle's chambers. This tool is less than $10 and it's easy to use. Since then, I've been able to reduce my case trimming by about 75% even after applying Sinclair's safety factor to the measurements.

While I'm not a benchrest shooter, I do reload and shoot for precision varmint hunting, and I have not detected any accuracy changes with cases of varying neck lengths. Of course, I trim when the neck length approaches maximum for that rifle's chamber.
 
Depending on the case construction and caliber,the case would get longer after you shoot it and the then resize it. For example, a fired 308 Lapua case in my 308 rifle would grow 0.006" after each firing and sizing.
 
I'm with K22 on this. Using the sinclair tool showed me that in my rifle in 223 i can safely trim to 1.760.
 
I'm with K22 on this. Using the sinclair tool showed me that in my rifle in 223 i can safely trim to 1.760.
Here's some examples of my 223 bolt rifles using the Sinclair chamber lenght gauge w/ Sinclair's recommended safety factor incorporated into the max length.

223 Tikka - 1.772
233 Rem - 1.778
223 Browning - 1.765
223 Weatherby - 1.766

As you can see, it can vary from rifle to rifle but all of them are greater than the published standard of 1.760 max length and that's with Sinclair safety margin incorporated into these figures which if I remember correctly is 0.020" or there abouts.
 
Those Sinclair chamber length gauge's are like my best friends. Every rifle I have gets it's brass matched to it till death do them part. Between that and light neck turning on factory barrels I never get any carbon past the neck which tells me I have an good seal that leads to consistency on my SD's.
 

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