Even though I've read of Re 15's temperature insensitivity, my Whelen typically shoots 2" low from a warmer fall sight in effort to the late November elk season. The rifle is glass pillar bedded and very stable otherwise. The only difference is the POI with temperature and about 3,000 feet of altitude. The wierdest part is that chronographing after the late seasons at home in low December-January temps results in similar velocities as during the earlier and warmer sightin effort. I haven't quite figured out the reason for the POI change. No big deal, I just dial in a little more elevation for the elk seasons and it works every time.
Re 19 does not produce the same result in my 280s, 30-06s, or a 338WM. Re 7 in my 45-70s does not appear to be significantly affected by temperature. Re 22 certainly did produce consistently, slightly lower velocity with lower temperatures in an old 7mm RM.
