Hmmm. I ran my upgraded SIG GSR that I've discussed in the other concurrently running thread for 171 rounds in an IDPA match yesterday, in 29 degree gradually increasing to 40 degree weather with absolutely zero problems, using Sellier & Bellot 230 gr ball in a variety of Check-Mate magazines, with my primary lubricant TW25B. I'll go out on a wild-assed limb and posit that using quality factory ammunition, tuned springs, decent magazines in aproperly cleaned and lubricated gun just might have been crucial factors in achieving a consistantly uneventful performance...
Best, Jon