I picked up some of the Hornady 62 grain FMJ to try out. According to this, https://press.hornady.com/assets/sit...-60-62gr-1.pdf . It says the COAL is 2.229" for the 62 grain FMJ.
From searching around on this site, It seems like the consensus leans towards loading to a COAL of 2.250". And when I loaded some bulk 62 grain PRIVI Partizan in the past that is the coal I used. That was also the stated coal in the latest Sierra reload book I use.
So I assume that the Hornady COAL is due to the cannelure. Then again, after web surfing I read on some various sites that they have worked up loads with a COAL of 2.220".
I guess I am curious about what would be the minimum length for a loaded round for the AR? I mean besides over pressure of the case, what would be the only other detriment, potential accuracy?
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