Load the magazine with 10 rounds for a while and break it in. I oiled my magazines before using them and gave them a good cleaning. The follower should be well cleaned and oiled. If you have a 702 magazine try it and see if it's a magazine issue.
The bolt should not go forward when an empty magazine is in the well because the follower stops the bolt from going forward. Pull the bolt back a little ways and push the charging handle in to keep the bolt locked back.
If the bolt won't go forward all the way then you may have a dirty gun or lack of oil. When I start experiencing the bolt not seating, I add oil. I usually add oil every 75 rounds and keep the chamber clean. I also run a bore brush when I add oil to clean the breach and ramp. The breach is a very small hole that needs cleaned of gunpowder residue, a lot.
I found the 715T does not run as well as the 702. But, if you keep the breach, chamber, and ramp clean and lubed the cycling will improve.