I have a lot of Carcanos and most have mint bores , I had no trouble finding them when looking for good bores . Yes , with the deep rifling used on Carcanos , an undersized bullet can go down the bore "off-centered " . I have found the M-41's to usually be the best shooters , and the easiest to get to shoot well of the 6.5's . The combination of the "odd-ball" bore size , lack of a good modern bullet , deep rifling and gain twist make the 6.5's a fight to get to shoot really well . The 7.35's on the other hand seem to work well with little effort . There is nothing wrong with the design of the rifle , as I have several that have been rebarreled in other calibers [ 6mm ,.358 , 32 Win ] , and they shoot just as well as any other modern hunting rifle .