I can say the 121 Hammers fly REALLY accurately, but BCs seem WAY inflated.
Like 6-8" low at 545, 12-14" low at 741, 18+" low at 921. I couldn't even estimate how low the 921 yard drop was. Pretty unexpected.
545 group was very good however. Like 1.5".
721 was about 2".
The vapor trail off the Hammers is a sight to see. Looks like a dust trail! I have a couple good videos of them, but here is a still frame of one.