If you do a search, this topic has been visited a few times, but I have killed 4 deer and 4 hogs with 30-30 LeverEvs and won't put anything else in my lever guns.

Keep in mind that they were created for use in the new Marlin XLR series of rifles with 24" barrels and 1:12 twist, and the "standard" Marlin 336 has a 20" barrel and a 1:10 twist. Some "standard" guns don't shoot LeverEvs as well as others do, but in my 336SS, they shoot easily under an inch at 100 yards (off a bench).

This picture is from a couple of weeks ago and was a boom/flop at 150 yards. The full story is in the "hog/exotics" section.