AR pressure signs...

by rob , Thursday, July 02, 2015, 14:20 (3436 days ago)

Last week I had a chance to shoot my loads in my AR with CFE223 powder and Barnes 55TSX. 27 grains was very accurate and 27.4 was almost as, so I came home loaded 10 each and today tried them again. Last week I had no issues of any kind but this week 27.4 was double feeding every one. Fed singly and they did fine for the most part but some failed to extract. When they double fed it mangled the cases. I fired 5 rounds 27, then 5 27.4 (double feeds), followed by 5 @27 (no probs) and finishing with 5 single loaded 27.4 and that's where some failed to extract. I can't imagine what this could be if not high pressure. I'd say primers look fine but that's almost a given short of extreme high pressures.