A lot will depend on body type and generally if the upper body/shoulder width is naturally wide, than wide sweeping lats usually follow. With a narrow, or even moderate body frame, a impressive wide sweep can be hard to obtain, but not impossible.. There are natural limits to any muscle size. n Also having natural wide or high lat inserts make a lot of difference.
Might suggest stretching with DB pullovers, either straight arm or the bent arm version. Don't need to go heavy, just work for the stretch and even trying to hold that stretch position at first. Advance the weight when needed, most can become very strong in pullover movements. If you have chinning rings/handles that allows for gripping with the fingers facing the body (semi curl grip) along with a very wide , than try those. Hang at the bottom position, to let the lats feel a full stretch. A regular chinning bar can also produce results.
If your gym has a nautilus pullover machine or a cross over nautilus lat machine, than your in luck, though not many places have these on site. Probably one of the better back/lat building machines around. If having only regular pullover machine, than use them , with the full attention on the stretch at the start of a rep. Even DL's, regular or SLDL's, with a higher rep range of 12-15, hit the lat's quite well for most guy's.
The best lat's I've seen, rather that through weight work, are on gymnast and rock climbers. Both do a lot of one arm training stretches and holds from the bottom position. Which can work well for BB'er's , either on a straight overhead bar or rings.
Might suggest twice a week on lat's And within a higher rep range for BB'ers. Though PL'er develop massive lat's/backs through low rep work. Just have to see how the body response's.
Good Luck..