Upside to your 30/30 is stopping power, downside is distance. The operational distance on a 30/30 round is only about 350-450 yards depending on conditions. Their such a large heavy round that they fall off quick.
I wholeheartedly agree. I have a Marlin 30/30. I know from personal experience that it can put a bullet Through a house (and so can a 45 pistol. What a fun day!). One shot one kill is important in any self-defense situation when your life is in danger and when it comes to zombies, that one shot really does count.
My first choise would be an M-14, with a 3-9x40 scope. This combines quick reloads by mag over most boltactions and leverguns with a high rate of accurate fire to take down the approaching hoard. Also, being .308Win calibre ammo is available all over Australia.
Mosin Nagant M91/30. Built tough,reliable and a caveman could even find out how to maintain it. Now being a bolt action and single stacked 5 shots isnt that much, but being at a long distance and only 1 shot per kill,it compensates for it. Its about 8lbs or so and close to 5ft long, so its kind of a burden to maneuver with but all in all its a very accurate.
or my Savage M89 LR...
It can shoot at a rapid rate with 10 shots, now it's .22 and they can be underpowered but also underestimated. When i go out shooting, i shoot this rifle for pure fun, fun because you can paint a target and most deff hit it all 10 times. Accurate as hell, light, and easy to use. It is a semi auto action and LR by length
M14A1 fully automatic assault rifle has always proved itself a very helpful little bugger in most situations. Especially with its ability to spray shot, single shot, and full auto which as always is a gigantic help