I've got more bad news for you Gadge, SSAA's insurance is through Allianz, and they will NOT cover any firearm more than 25 years old, PERIOD!

(Pretty sure it was 25 years, something like that...)

Not a single firearm in my collection was eligible for cover!
SSAA need their heads read for supporting a deal like that!
Kiss 'em off...

Also, they require you to transfer over your entire contents policy to them, and firearms can only be up to 25% of the total. With some haggling, they agreed to consider up to 50%, but no more. If you're like me, the average sporting arm in my safe is worth about 5 times the average sofa in my lounge-room!

SSAA specialist insurance tailored for gun-owners? Not even close... !

FWIW, TIO insurance in the NT will cover any item as part of a contents policy up to $100,000 total, the onus is on you to prove the value when making a claim. If you want more than a hundred grand total, that's OK too but they will send out a valuer to make sure you're not setting them up for a scam. Dunno how they'd handle vintage rifles, but I bet they'd be sensible about it. No restriction on what proportion of the cover is firearms, as long as you don't deliberately under-value the rest of your stuff.

...and you get free Croc-Attack cover thrown in!