So after working up a load with Hornady .224 60 gr SP (and absolutely loving that bullet) I decided to try something new. I got a box of Sierra 55 gr fmjbt with cannelure to play with. It didn't say there's a cannelure on the box so I'm assuming all of their 55 gr fmjbt stuff has it? I didn't get very good results with the Sierra 50 gr so I'll try the 55 gr and see what happens. Anyway, onto my question. I'm looking up load data and getting conflicting info. Sierra's loadings are a lot hotter than Accurate's, but their stuff is listed specifically for the AR-15. I looked up Hornady's info and for their 55 gr fmjbt it matches Sierra's. Here's the differences I'm seeing using AA-2230: Sierra: 23.3 min - 26.1 max Hornady: 24min - 26 max Accurate: 22.2 min - 24.7 max The huge difference has me a little nervous, and because it's the powder manufacturer makes it worse. Would you guys feel comfortable using Sierra/hornady's info or Accurate's? I inclined to use the former because it's two sources that agree. Thanks guys!