On day 1 a song has 200 spins
On day 2 the song has 300 spins
*A week later*
On day 8 the song has 1,000 spins
On day 9 the song has 1,200 spins
On day 8 the bullet will be +800 (1,000-200=800) as that's the amount of spins the song has gained in the last 7 days.
On day 9 the bullet will be +900 (1,200-300=900) as that's the amount of spins the song has gained in the last 7 days.
The 'bullet increase/bullet+' on day 9 is +200 (1,200-1,000=200) as the bullet has increased by that amount compared to the previous day
