The Omega plug on the left, TC Triumph plug on the right for a comparsion. The Omega plug has a much shorter flame path than the Triumph, better for igniting BH209. Only Federal or CCI209M's are used in the Triumph plug, I don't think I could trust it with a Winchester primer.
The Omega powder end has a deeper recess, better than a flat face like on a factory CVA breech plug. The factory Omega breech plug is about as good as you can get to reliably ignite BH209. I use Winchester primers in my Omega, I don't worry about it not igniting BH209, even in very cold temps.