Originally Posted by
Dorkus
Considering you are in Whangarei, I assume most of your diving will be similar areas to mine. General advice is east coast north of Gizzy - Go for a 120cm gun. South of Gizzy to Wellington/Kaikoura- Go 90-110. South of Kaikoura - Go north.
That said, a 110 will do 90% of what you will want it to. It is kinda similar to the 308/243 debate - If you go smaller then you need to get closer and be more selective with your shot placement.
Send me a PM and I can possibly get a mate in Whangarei to get you out in some borrowed gear so you can try before you buy - Alternatively, I'm less than an hour away and you can always come out with me (I've got all manner of guns between 90 and 140cm).