The flash hole of the Triumph breech plug is very close to 0.029", and i am assuming the bone collector uses the same breech plug. I don't really know.

I also checked the flash hole of the Omega breech plug, and it is the same as the Triumph, and the Accura; 0.029". There is more at play than just flash hole size when it comes to igniting BH209 than just flash hole size. The Omega is 100% reliable in lighting BH209, but the Accura has a hang fire once only very seldom. It seems to me the shape of the muzzle end of the breech plugs could be more important than the size of the flash hole, within reason.