I like the idea of vent liners, but isn't the one on the face of the BP going the wrong way? It moved the powder farther away from the primer.

I think your wording on the thread is wrong, but that's my opinion. I think you will start to see more people post on forums if they stay like they are today. You really don't see people intentionally starting trouble anymore. But I do get a lot of PM'S from people who don't wanna post and that's ok to. Sometimes it because of spelling or really not knowing what or how to say it. I think you'll see more in the future!!

I have both the Omega and the original Lehigh plug. I gave the nod to the Omega because the "standard" plug shipped with the gun works fine. You have to order and pay more for the Knight/Lehigh plug (or you did the last time I was in the market)

I also have both an Omega and a Lehigh removable ventliner BP, picked up on Dave's last run before he committed to Knight. I've never had a problem with either. Like you, I voted for the Omega because it came stock with my X7.

Correct and because of its cone shape facing forward it deflects a lot of the blow back gasses away from the flash hole and back up into the load. IMO - it is the way to go - it reduces the pressure felt on the nose of the primer...

What do you suggest?

No, me thinks what you wrote is incorrect. Pressure is consistent everywhere, no matter the shape of the vent liner. Gas particles headed toward the flash hole hit the flash hole no matter the shape around the flash hole. Particles not flying toward the flash hole, don't fly up the channel, no matter the shape of the vent liner.

The chemist forum member, JStanley, showed a drawing of the combustion, in a thread here on this forum a couple three year ago. His drawing showed the gasses of combustion, reaching the primer identically for domed or flat vent liners.

Instead of the best BH209 plug like you said. I would say more like what's your favorite BH209 plug is more in line. I have used/ tested every plug you mentioned above. I don't think to many people can say that at all. I can tell you the Lehigh plug is the best with the Omega a very close second. I actually tested more in the encore which takes the same plug as the Omega.

No Ron your are incorrect, gasses push back down the bore equally all the way around the bore. The as the gasses come back down the bore and encounter the cone their angle of incidence is changed from straight back and down then deflected into or towards the flash channel. With the cone the gas pressure is deflected to the side of the bore or breech plug and back across the cone to the other wall. In effect reducing some of the back pressure passing back through the flash channel. There was a drawing created by a math guy that showed the reaction but I am unable to find it now.

But I think if you visualize the normal flash hole construction on the powder side, the area of the flash hole is usually an inverted cone allowing a small portion the powder to come closer to the flash hole or even a flat flash hole. With ignition those same blow back gasses react straight back to the inverted cone and down the sides of the cone to the flash hole.

Turning the cone over creates the opposite movement.

Example take a cone - invert it and pour water in it where does the water tend to go? Then take the cone and place the point up and pour water on it just the opposite happens water is deflected away from the center of the cone. It only last for a moment in an enclosed tube before the water/pressure builds up enough that it essentially over flows and then does go back through the flash channel. But as soon as the bullet exits the barrel it creates the opposite reaction and sucks the bore out. I know it is a stupid simple simulation but the easiest way I can think of to explain it. If I could find the drawing and simulation the math guy did - it makes much more sense.

One other point when I was rebuilding breech plugs and testing the effect, at that time by reading the shot primer you could see the differences in the flow of the primer created by pressure around the hammer imprint in the expended primer with identical loads of powder and bullet. There was a DIFFERENCE

Mike, what you write is interesting, and imaginative, but i remain unconvinced. My recollection, is the scientist that addressed this issue, wrote that the shape of the vent liner is irrelevant, to the amount of pressure reaching the primer. My inclination is to side with science.

The pressure on the primer increases with increasing flash hole size. The pressure on the primer decreases with increasing flame channel volume. These i believe.

Yes, i believe there are characteristics that affect the pressure on the primer, but the shape of the vent liner is not one of them.