Attached is a link with some good info on husqvarnas.
Later (newer) ones were pushfeed and even later ones were not made by husqvarna. One common problem with them (husqvarnas) is stock cracking/chipping, particularily the tang area, behind the recoil lug and between the mag box and trigger area. Other than a missing chip behind the tang the others can be fixed pretty easily. Usually the stock triggers (on the small rings) are nothing to write home about, as issued.
Given all that, if I ever run into a reasonably priced model 4000 in something less than 30-06 I'll be hard pressed not to grab it. One in 6.5x55 (not sure they were ever catalogued) would make an excellent deer rifle, for me.
http://www.canadiangunnutz.com/forum/showthread.php?t=486796