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I have two semi-autos that shoot 5.56/.223. One is 1:7, 16 inch barrel and the other is 1:10, 21 inch barrel. 55 grain for the 1:10 and 62 grain and above for the 1:7.

62 grain works OK on the 1:10, but 55 grain is more accurate.

I have my ammo to gun ratio perfect. More 62 and above grain for my go-to SHTF gun and plenty of 55 grain for my plinking gun.

I have noticed in the graphs and charts that you will find on the internet, they never use the length of the barrel in their calculations. A 16 inch barrel is much different than a 20" barrel with the same twist.
 
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Good discussion guys. Thanks for the exchange.

I am a Varminter / Long Range shooter by nature so I think that may color my view.

It's all good. Just git out and shoot, that's the main thing! :)
 
Just because it's from one manufacturer, IMHO, it doesn't mean all that much.

Example: Say that you bought some Winchester, brass cased, .223, 55 gr., FMJ ammo. Did you note that from one box to another, the shooting might be different? Yeah....the impact points are different. Did you take note of the "different lot numbers" printed on the boxes? OK, Ok, ok.....now, do you see what I'm trying to say?

Yeah.....next time.....buy the sealed case. That way, you might be in for better results.

Aloha, Mark

PS.....what to do with the odd and ends?

A: IMHO, just shoot it and enjoy life more.
The differing lots of ammo will probably (likely) strike within a "close enough" dispersion area. LOL....it's not like your targets/enemies care. ;)
 
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