Tested damage from a nearly 9.5m DD with no AMF in play in order to backup my opinion that CoC worked better than SG against large walls.
Target is LA's 503 AC Wall
SG:
X-Wing's familiar touches Hardcore [2362483]
X-Wing's familiar touches Hardcore [2818803]
X-Wing's familiar touches Hardcore [1749066]
X-Wing's familiar touches Hardcore [2308950]
X-Wing's familiar touches Hardcore [1678164]
X-Wing's familiar touches Hardcore [1596357]
X-Wing's familiar touches Hardcore [2460864]
X-Wing's familiar touches Hardcore [2394922]
X-Wing's familiar touches Hardcore [1852753]
X-Wing's familiar touches Hardcore [2897969]
CoC:
X-Wing's familiar's Cone of Cold hit Hardcore [2210635]
X-Wing's familiar's Cone of Cold hit Hardcore [1493087]
X-Wing's familiar's Cone of Cold hit Hardcore [1306756]
X-Wing's familiar's Cone of Cold hit Hardcore [1256272]
X-Wing's familiar's Cone of Cold hit Hardcore [1367917]
X-Wing's familiar's Cone of Cold hit Hardcore [839948]
(it's at this point I start enjoying a lovely meal of crow and hat...)