lar45
08-17-2020, 02:41 PM
Morning, I got abit of shooting in yesterday with the AR Pistol in 7.62x39. I had a bunch of the 190gn Fat30 bullets lubed with Carnauba Red and sized to .311 sitting on the shelf, so I loaded some and shot them.
I thought instead of trying the rifle powders like I did last time with no luck, that I'd try 2400. I didn't do a proper ladder test, I only loaded 3 rounds each at a few powder charges just to see if anything positive might happen.
10gn 1122fps 2.8"
12gn 1286fps 1.31"
14gn 1452fps 1.95"
16gn 1590fps 5" verticle spread
17gn 1681fps 4" horizontal spread
http://www.lsstuff.com/pics/ar-pistol/fat30-2400.jpg
So I switched to A1680 to see if I could go faster with a slower powder.
18gn 1484fps 1.785"
20gn 1616fps 1.94"
22gn 1771fps 10" verticle spread
http://www.lsstuff.com/pics/ar-pistol/fat30-1680.jpg
So it looks like I should load more rounds with 1680 and shoot more than 3 per group, then maybe try a slower powder to see if I can get to 1700fps ish
I thought instead of trying the rifle powders like I did last time with no luck, that I'd try 2400. I didn't do a proper ladder test, I only loaded 3 rounds each at a few powder charges just to see if anything positive might happen.
10gn 1122fps 2.8"
12gn 1286fps 1.31"
14gn 1452fps 1.95"
16gn 1590fps 5" verticle spread
17gn 1681fps 4" horizontal spread
http://www.lsstuff.com/pics/ar-pistol/fat30-2400.jpg
So I switched to A1680 to see if I could go faster with a slower powder.
18gn 1484fps 1.785"
20gn 1616fps 1.94"
22gn 1771fps 10" verticle spread
http://www.lsstuff.com/pics/ar-pistol/fat30-1680.jpg
So it looks like I should load more rounds with 1680 and shoot more than 3 per group, then maybe try a slower powder to see if I can get to 1700fps ish