Wind and mirage conditions change often at our range, so I find that shooting several 3-shot groups, allows for barrel cooling and better groups. That's a better test of the rifle than shooting longer strings and waiting longer between shots.
Wind flags and knowing how to use them is a big factor in getting good groups on our range. We have berms between ranges that cause swirling winds, even downdrafts, at times. I use at least 3 flags.
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