When I have a new or nearly new gun at the range for the first few times, I take 3X5 cards and make notes about the types of ammo I am using and I put more detailed notes on the targets that I have shot and I save them for a while as a reference. I do this for maybe the first 150 to 300 rds or maybe 3 range trips. If all goes well up until them, I only go by the total number of boxes of ammo I use per range visit up to 1K rds, then no notes after that.
If it runs well, that is, REAL WELL, it stay until further notice. Any repeat issues are either repaired or it's history. I will not own finicky firearms, period.