jsand, if all of the groups are consistently larger than expected, try seating the bullet further out toward the lands. When shooting for accuracy with a bolt gun, you'll want to know the point at which the bullet will touch the lands when a round is in the chamber. I usually start load development at .015 off the lands.
Also as a side note, I really don't think you got the barrel too hot, in the match's I shoot in were shooting 25 rounds in 15 minutes, on 90 degree days. I can touch the barrels after a string like that but I can't keep my hand there for more than a couple seconds. No one is losing any accuracy over it but POI may walk a little bit.
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