I am not sure what the difference is but I have a 1975 or so 700BDL that will not feed rounds singly unless they are pressed down into the magazine.
I have a much newer 700P that feeds single rounds just fine just by laying them between the rails. That rifle does not do a real good job of loading rounds into the chamber when the rounds are pressed down into the magazine.
I do not know why the rifles seem to be so different in that regard. I tend to only shoot one round at a time rather than loading the magazine and going from there.
If I was still hunting, that would certainly be an issue for me.
Both rifles are short action. One is a 22-250 and the other newer rifle is a .308.
It is not really a problem for me because of the way I use the rifles, but it is an issue between them.
Geetarman