I am looking at buying a Mosin Nagant. I have looked on here at the threads and was wondering if there was any difference in accuracy or overall performance between the round receiver or the hexagonal receiver? I know from online that the Mosin's with the hexagonal receiver are priced higher than the round receivers are higher. . . being so, I figured there must be a difference between the two, where the hexagonal receiver is better. . why is that?