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I once kicked 4 goals in the first quarter back in U/10s as a ruckman. I considered that a bag due to the fact of the position and the amount of time I got it in (15mins quarters). Just thought I would share yet another awesomeness story from myself.
I reckon its changed, back in the 90s or early 00s a bag would have to be 7 or more, maybe a 6 if it was a low scoring game, but these days I reckon you almost count 5 as a bag unfortunately
This is not an individual thing, it is almost completely down to the way the game is played.
Higher rotations, greater spreads of goal kickers to minimise predictability, less latitude with what forwards are allowed to do to out body opponents, more onus on defensive structures and specialised defenders, lower scoring opportunities due to zones and flooding.