When having sure shot stacks, hitting a headshot should not consume sure shot as well as give one ammo similarly to conservative shooter. This should then also stack with conservative shooter and scrounger and other ammo effects.
Ammo refund is currently weak on huntsman. The only way to regenerate ammo is to use ult (barring special kills, and scrounger), so I think adding a little more incentive to repeat headshots would be nice. Although waste not, want not is gone, this should emulate it to a degree without fully being reimplemented. This also makes reset a little more valuable because it makes farming ammo easier.