Just wondering, since you say it shoots well some days and not others, what is your twist rate? Could it be that you have a marginal twist and that it shoots well on warm days (less dense air) and not on cooler days (more dense air) when the bullets will be marginally stable? What is the forecast like for the next few days?
If it is for warm weather it might work well, if it will be cool weather, maybe put your gun away and just harass other shooters, telling them that you would have spotted the wind changes they all missed.
If it is for warm weather it might work well, if it will be cool weather, maybe put your gun away and just harass other shooters, telling them that you would have spotted the wind changes they all missed.