I have been reloading for bolt guns for quite some time. I recently decided to start reloading for my ar. So i purchased some everglades 55 grain round nose fmj bullets and some cfe 223. I started with 25.9 grains and worked up to 27.7 grains. My velocities ran low which i can deal with because my 16" barrel is a far cry from the 24" that they used for the data. But on my higher loads i had several fail to feeds. The spent case jams with the next round trying to feed. I have since tryed other primers, including magnums, with the same results. I then tried winchester 748 and had the same results on the high end. Since they both are on the slowest end of suitable powder birn rates i have decider to go faster and decided to try 8208xbr. I have not had a chance to test these yet. I know this is a ammo issue because my firearm functions flawlessly on factory ammo. I am looking to make a xm193 equivalent, which fires at 3115 fps from my ar. The highest I've gotten so far was the high 2900's with monumental failures. Any insight would be greatly apreciated. Thanks in advance.