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Reply to "Ammo Option for 8.5” 5.56mm SBR?"

I have done no testing, but have done some research into this and have come up with zero loads manufactured for ultra short 5.56 barrels (less than 10.5").   The introduction of the LVAW in 5.56 for the SAS made me wonder if Sig or similar would develop a load for that platform to perform out of the 5.5" barrel, but I haven't seen one.  Sig producing the rattler platform commercially in .300 instead of the originally requested 5.56 seems to indicate that either the end users or the engineers or both realized that the .300 took much better to such a short length than the 5.56 but that is all supposition on my part. 

Sig does produce a specific rattler load in the .300 to maximize potential out of the 5.5" tube.  

 

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