The Winchester W209 primer is what i have been using in my Triumph to ignite BH209. Ignition has been 100% so far in about 150 shots. I haven't tried the Triumph in cold weather yet.

I have had 100% success using the W209 primer to ignite BH209 in my Omega in the very very cold. In the past 2 hunting seasons, my Omega has been in the truck overnight, loaded, when temperatures have been as cold as -19* or so.

After the past season ended, i was able to modify the Accura breech plug, so it more resembles the Omega breech plug. Since then the Accura has been 100% igniting BH209 with W209 primer. If i have been some successful this coming season, i will try the W209 primer in the Accura this coming January. If we don't have enough meat, i will not take a chance with the W209 in the Accura, and in it i will use Federal 209A primer to ignite BH209.