The only way that I could see a VLD having a feeding issue from a magazine is if the person was trying to load his rounds as long as possible and still fit in the magazine. Sometimes when doing this, you can seat the bullet out too far and still have it go into the magazine with a little force. This can cause the rounds to bind up in the magazine.
I don't know about the factory loaded ammo though as I have never tried it.
You got a pretty good answer above. It's going to depend on what type of action and length of magazine. If the bullet is seated too far out the tip is going to bind on the top of the chamber in some cases because of the angle.
The custom builders take this into consideration and angle their feed ramps accordingly whereas factory rifles will be designed to SAAMI Specs including maximum length.
Of course with a controlled round feed like the M-70 that's not even an issue and you will have no problems as long as they don't exceed your magazine length.