Thanks Brother PJ! I've tested R15 in my old 35 WAI down to single digits at the range and there was absolutely 'zero" change of any kind. I "did" see some loss of velocity in a 760 .280 load, but zero was unaffected out to 200yds. When it gets super cold my eyes start watering and I can't shoot well beyond 200 unless conditions are right ( dryer, no wind,etc). Thanks again Pard.