i am not saying this out of experience or absolute knowledge but in my own personal opinion i would much rather have the bh209bp breech plug in place.the bh209bp allows the loose powder charge to get much closer to the primer i would think that it would allow for quicker and more consistent ignition of the powder charge ? i wouldn't think that they would go thru the trouble or expense of making the bh209bp if they didn't think there was a valid reason for it ?