I learned long ago that anything that might change the vibrations of a rifle could impact group size or POI. Not necessarily will...but could. I received my Goat a couple of days ago and took it out yesterday to try out. I happened to have a recent 3 shot group target that I fired with the Grendel and, with the Goat attached, the 3 shot group I fired overlaid the previous group exactly. However, with my 223 the POI shifted enough to notice. Not enough for me to miss a varmint at the ranges I'll shoot, but noticeable. The group opened up significantly as well, but that could just be me. The POI change was not.

Just wondered if anyone else had noticed differences with and without the Goat. That being said, I certainly do like the way it catches brass! Much better than any method I've tried before.