I picked up this rifle at Gander Mountain recently and am attempting to determine it's bore by slugging. It's a five groove and proving problematic. Using a standard 1" mic it checks .312 across from a land to a groove. I was unable to measure the land height in the slug with my caliper end. I then used a jewelers loupe and good lighting to look while I held it in place in the mic trying to visualize the arc of the land to estimate it. If I am anywhere close doing this it would have a .314-.315 bore. If I size bigger than this does the Enfield have a chamber neck big enough to let it go? I don't have any live ammo for it yet and every where I looked there was none in stock.