In my Optima I got the BlackHorn 209 breech plug from CVA. I also shoot a very hot primer.. the STS made by Remington. My rifle likes "by volume" 90 grains of BlackHorn 209. Some of the projectiles I have tried are the short black Nosler sabots with 300 grain Hornady XTPs.
It also shoots SST's very well. And I have been testing the rifle with some Scorpion 260 grain Hornady PT Gold bullets and short back sabots. Again, a very good shooting system.
And when I shoot BlackHorn 209 in the Optima, I do not swab.