Tested a set of reloads based on the Sierra Manual for .223/5.56 in a Wylde chambered AR with the 69gr smk with Varget. Used mixed brass both .223 and 5.56 so there were certainly pressure differences based on internal case dimensions. I started at 24.7gr and did loads increasing in .2 gr up to the maximum of 25.7gr. Just like yesterday with RL15. Shot from the bench supported only on the front on a rest and my hand on the shoulder stock. Overall the reloads were 1-2"@100 but the ones from 25.1 - 25.5 were all under an inch. So I need to refine my results between those two loads. Excellent morning shooting too. Everything went well. When you consider the X855 were like 4-6" clearly some work will make your shooting life much better. Source: http://accurateshooter.net/Downloads/sierra223ar.pdf BTW, I am using a 40x scope on the rifle for the load development. It looks like some wannabe swat guy's wet dream. Have to post a pic of that... pretty funny but it means I don't need a spotting scope.