First of all I'm not trying to load for precision shooting, but I do want accurate ammo. I have an AR15 with a chrome lined 5.56mm chamber and a 14.5" barrel that I'm working up a load with CCI 400 primers, Hodgdon H335 and Hornady 55gr FMJBT W/C bullets. I started with the published start load of 22gr. My last trip to the range I took 23.6gr and 24.3gr. (in Lake City Brass). Everything cycled fine and the groups were getting closer with more powder. Between the two loads the accuracy of the 24.3gr load seemed to be acceptable for me and I think I could be fine calling it good at 24.3 grains. However, for both the 23.6gr and 24.3gr loads 1-2 cases LOOKED like they MAY have flatten primers. I was a bit surprised by this since a lot of people load 25+grains with no problems and the published max load is 25.3gr. Maybe my evaluation of the primers is wrong and they weren't actually flattened, I don't know. Anyway, to my questions... NOTE: I'm more focused on safety than anything else. POWDER: I'm using an RCBS Uniflow powder measure (with pistol rotor) that seems to throw variances anywhere from plus or minus .1 to .3 grains. I've been hand pouring the powder with a funnel, but would like to just put each case up under the powder measure to speed up the process. Is it reasonable for me to just accept the slight variances in powder from the powder measure? Say for instance dial in 24.3gr and then accept whatever it throws me plus or minus .1 to .3 grains? Even +.3 grains would be under the published max of 25.3gr. BULLET SEATING: The published OAL is 2.220 and I'm stopping at 2.225 because my seating die (just like my powder measure) seats plus or minus. That way if it's minus I'm not under 2.220, but the OAL length of each round isn't exactly the same. CASE TRIM: I trim my cases to 1.751 and at an OAL of 2.220 the cannelure isn't below the case mouth rim, it's about half way which means the crimp is being applied below the cannelure or at best the very bottom of the cannelure. Does this sound like a reasonable process for loading .223?