The last time I went to the range with my mosi the rounds were sometimes keyholing and when they werent they were wildly inaccurate. My friend had his mosi as well and his was working fine. My rifle has never done this before and, up until now, led me to believe it is a fairly accurate and reliable rifle. I have never had an issue before with this and the only thing i can think of is maybe it was the ammunition. We were using some old surplus ammunition at first and my rifle was keyholing so we put it down and only used his with some brown bear and silver bear. Do you think the ammunition could be the issue? i have inspected the barrel and bolt and (although im not a gunsmith) cant find any problems or spurs or anything like that. Next time i shoot i will use some of my reserve 7n14 ammo and see if it does it then. Im just curiuos if anything else could cause it besides the ammo. Like i said i have never had this issue before.