More .223 reloading questions

Glock 40

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Special Hen
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I am puzzled by your Federal 223 being so short. I just checked 3 different brands of 55gr 5.56/223 and here are the OAL
Size from top to bottom this is new ammo from box.
Remington 2.239
Winchester 2.240
Federal 2.256

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Glock 40

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Special Hen
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That doesn’t make sense does it ? Your federal rounds are substantially longer than mine and they have the OAL I would expect.
I suggest you check some other ammo if you own some or can find some. I don't know why the ammo you are looking at is so short, but I think that is your problem is you are trying to compare to something that isn't the norm. I just grabbed 3 random brands and boxes that were all new to pull those samples from.
 
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