I've not shot an rfb, but going by the groups I've seen of rfb's on here, and the groups the xcr-m was putting down at 300 meters with federal 168gr gmm today, I'd say the xcr-m is a good bit more accurate.
Here's a video of some goofing around today.
http://vimeo.com/37223224
Do you have any pics of these 300 meter groups? Was it sub MOA?
Thanks


















































