A while back a member here sent me the Don Miller Stability Formula applet, thank you If I go on the Berger website I see that 308155V requires a 14 twist barrel. If I plug in the info on that bullet from the Berger website into the Don Miller program: @40 degrees and 2900fps The program shows a stability of only 1.09 and that it should really have a 12.4 twist for optimum stability. I currently shoot a 14 twist and a bit faster MV with good accuracy but I am shooting in 60 degree temps! I am a bit concerned about cold weather shooting with this setup now, should I be? I may see temperatures into the single digits on occasion which will drop my velocity a bit and with high pressure I may be less than 1.00 according to the program!!! I would assume that Berger anticipates all temperature extremes with their recommendation of 1:14 twist minimum, but............ edge.