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I brought one blade start of the year and have cut down the back bone of 3 deer and a hogget. Still scary sharp but one tooth has chipped the end off. I doubt they'd last a long time as bone seems...

Yep Mickey they're the business.
Go grab yourself one of https://www.bunnings.co.nz/diablo-9-fleam-ground-reciprocating-saw-blade-for-pruning_p0098004
Then you'll whip through the back bone of a...