Hey guys, I'm aware of the difference/history behind these cartridges. ..However, does anyone have data chronographing these two with 55 grain loads from the same gun? How much of a difference in velocity is it? I'm looking at wikipedia and it's saying the 55 grain .223 is running at 3,240 fps. Which seems high for a .223 if it indeed does have a few thousand less PSI for specs.