Took the new Bushmaster out plinking yesterday and shot the last 100 rds I had. Had some Monarch .223 55gr Steel case FMJ ammo. I noticed the bolt didn't lock back after the last round was shot except one time with this ammo. Shot 20 of the Wolf 5.56 62 gr HP and the bolt did lock back after the last shot. Was wondering if this is due to the "cheap" .223 ammo and if the 5.56 pressure was enough to get the bolt to lock up. Only had 1 jam with the Monarch ammo and was thinking it was due to the bolt not picking up the round good enough. The jam was also in a 20 rd mag a guy gave me and he said it would jam his gun and was going to throw it away anways. Shot 60 rds thru it and only had that one jam. I have 500 winchester cases due tomorrow and was going to start reloading using 55gr soft point bullets I have on hand. Was also wondering if the bolt not locking back would be a sign I need a little more pressure? Have never loaded for a semi before. Any help would be appreciated...I will have more questions in the future I am sure.
