Best practice for avoiding the problem altogether is to seat a few thousandths shy of where the ultimate seating depth is and finish seating as close to when you want to shoot the rounds as possible. For this, an arbor press and seating dies that work with it will allow you to accomplish this at the range. I understand seating prior to a match is what the Army Marksmanship Unit does over at Fort Benning where it is definitely hot and humid.
Because copper and its alloy brass would be a fairly benign galvanic couple - this so called "bullet welding" would likely be due to crevice corrosion rather than galvanic corrosion. If one were to pull a bullet where this type of corrosion is at work, there will be a thin and faint (due to scraping it off while pulling the bullet) dark ring somewhere on the bearing surface of the bullet and a similar one inside the case neck. This phenomenon can really screw up the neck grip of your loads as the force necessary the push the bullet out of the case neck will be many times greater than the force required to seat the bullet. Moving the bullet in the case neck a little prior to shooting it is the best way to mitigate the problem.
Because copper and its alloy brass would be a fairly benign galvanic couple - this so called "bullet welding" would likely be due to crevice corrosion rather than galvanic corrosion. If one were to pull a bullet where this type of corrosion is at work, there will be a thin and faint (due to scraping it off while pulling the bullet) dark ring somewhere on the bearing surface of the bullet and a similar one inside the case neck. This phenomenon can really screw up the neck grip of your loads as the force necessary the push the bullet out of the case neck will be many times greater than the force required to seat the bullet. Moving the bullet in the case neck a little prior to shooting it is the best way to mitigate the problem.