F-Class shooters rarely do any loading at a match. We shoot too many rounds per string and there's typically not enough time, so the vast majority load before the match. I have never actually even seen someone loading rounds at an F-Class match, although that doesn't mean it never happens. Sometimes at larger matches, F-Class shooters will load before traveling, seating the bullets slightly long, then re-seat bullets to the desired seating depth in the hotel the night before. The advent of e-targets and not having to do pit duty at ranges which have them might possibly free up a little more time and enable this practice to become more commonplace at F-Class matches, but I doubt you'll ever see a lot of it.
The type of loading done at a match you described sounds more like what BR shooters do. Because of the differences in the formats of F-Class and BR shooting, reloading for F-Class typically has a slightly different emphasis. Although good precision is critical, the goal is not necessarily a load that will shoot in the zeros at 100 yd, but one that will maintain good precision over the long strings of fire (20+ shots). During the 10 to 15 minutes most F-Class shooters require to complete their 20 shots for record, changes in the wind conditions are far more likely to become the limiting source of error in terms of scoring. Very small differences in precision that can make a huge difference in BR shooting don't have as much impact when a missed wind call can easily put your shot out into the 8-ring, 7-ring, or even worse (i.e. wind deflection of 3 to 4 MOA, or greater). In an actual F-Class match, a load that can consistently shoot 0.25 MOA groups in calm conditions at 100 yd is capable of producing the same scores and X-counts as one that will shoot 0.1 MOA. In other words, pure precision of the load is no longer the limiting factor. Thus, maintaining consistent velocity ES/SD over long strings of fire is something F-Class shooters pay more attention to.
If you're interested in learning/understanding the approaches BR shooters use to adjust their loads for specific conditions, this is a great forum in which to ask that question. Hopefully a few will chime in on what they do and how it pertains to specific conditions.
