There are a few threads on here that discuss at length how many shots you need to fire for a group is "representaive" of the rifle/ammo. Most degenerate into he said she said kind of thing and thankfully disappear but before then theres some good stuff as well.
Chasing groups is imo a waste of time after a certain point, the definition of an accurate hunting rifle to my mind is one that puts all its shots into the targets kill zone at the maximum normal hunting range.
If your groups are shot at 42 metres (46 yards) then as viper has said you have enough accuracy right now, and any little improvements probably wont repay the time effort and cash required to get them.
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