I've been trying to get AR Comp to work in either 6ARC or 223/556 but it seems like it is way slow in both. I loaded 24.2 grains of comp in 223 with a Nosler 60 bt. If memory serves, QL had it expected to be in the 2900 range from my 16" AR. Actual is much lower at <2500 where 8208 runs 2700. My 8# jug of 8208 is well over 10 years old. The 1# bottle of Comp I just bought recently.