tobnpr, I've never known a top ranked prone shooter put his body aligned behind a high power rifle such that the rifle recoils straight back. To do that means the shooter's backbone has to be angled a bit to the right for a right handed shooter 'cause the rifle butt's in his right shoulder pocket. Several have their body axis pretty much inline with the rifle, but still angled a little bit to the left.
Nancy Tompkins new book states what I've also seen and done to do the best; the shooter's body is angled 15 to 30 degrees off the line of sight to the target. Any less angle means one's arms may not be able to be positioned correctly to hold the rifle as still as possible.
I don't think there would be any difference using a bipod or some other front rest. At least not when I've done it.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master
Last edited by Bart B.; February 26, 2013 at 11:49 AM.