When DP P14 rifles were available for $25.00 to $35.00 each I built a number of rifles on the actions.Largest round was .416 Rigby.I also did .375 H&H,6.5X68,8X68,.338 Lapua,7X66 Vom Hofe,and 7X68 Askins.The receiver rails will require extensive work to get most rounds to feed.Best magazine box to use is the magnum box sold by Gun Parts Corporation.P14 bolts are correct bolt face size for most belted magnums.I also built a pair of .30 belted Newtons on the actions.