Today I was shooting my Rem 700P in 7mmRemMag. Barrel has very little wear, I think. I was shooting the Hornady 154gr SST, VihtaVuori N560 and Rem 9.5M primers with Weatherby (Norma) brass. Bullets kissing the lands. Kinda warm here in N.C., 78-80F, and humid. I started out @ 65.0 gns, velocity was 2970/2992/3011. At 65.5 gns velocity was 3024/3053/3086 and at 66.0 gns velocity was 3098/3117/3142. I tried to let the barrel cool in between shots. Started with waiting 2 minutes, then went to 3 and eventually at 5 minutes. Even put rifle in truck with AC going to get temp back down. When I say "down" I'm not talking cold steel, just warm to the back of the hand. Powder was double weighed on RCBS 5-0-5 beam and Ohaus GT400 electronic scale0. Question: what made my velocity climb with each shot? Anyone ever see this? JohnnyK.