Lynn, 40 seconds is not exactly what I call "pick'n". Going up to 1 minute even isnt' all that much slower. With a light gun, that's about as fast as most can go. With a heavy gun, yes, that's slower, but not bad.
What is typical Williamsport weather for this time of the year?
Conditions this time of year are usually as good as they get. By no means as good as they get at some other places. Early spring and late fall are usually horrible. It's really more of a survival deal than anything then. All ranges have good and bad days, and good and bad times of day. Last weekend here was really pretty nice most of the time, though scoring on Saturday was tough all day long, and Sunday was as nice as it's ever been for 8 relays. Unfortunately, I wasn't in those 8.
It's not unusual here to see every flag on the range going a different direction. That is no exaggeration. There's nothing to see, and you're at the mercy of the wind. The best policy is to have a gun that shoots well in switching wind. Mirage is not even a concern here, or at least I don't think so.
Stop in for the World Open sometime. If there's a shoot in the country worth traveling for, that's the one. If you do anything, and I mean anything at all, you're leaving with something. The prizes are worth the trip.
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On the subject of "perfect practice", I'd say one of the most important things a person can do is keep good records, so as to not make the same mistake over and over... and over...