[shaunpain]

I really don't think there's much to worry about with the "gash". While I have heard of a perfect crown being of paramount importance in a precision rifle, I would imagine that this imperfection is negligible, most likely imperceptible to a human, and that finer accuracy is something that the platform is inherently incapable of. Admittedly, I am an amateur in comparison to almost everyone else on this forum. However, I have pistols in worse shape that I can fire into the black at reasonable distances, so I think you're good to go.