Growth Thwarts Va. Hunters The dawn is still, a faint brightening just above the dried husks of a Purcellville cornfield, the moon still bright. Jay McKeever freezes and slowly inches down into a squat. A white-tailed buck emerges from a thicket of bare trees, the "big boy" he has tracked all morning. The buck, colorblind to the blaze orange baseball cap McKeever wears, comes to a halt. It would be a perfect shot -- and a rack of antlers worth mounting. McKeever curses quietly, his Browning .270-caliber deer hunting rifle, with scope, untouched on the frozen ground next to...