Originally Posted by
ronlaughlin
Golly, and i tried as hard as i could......................the liner in my V2 plug has seen around 200 shots; maybe more, and the flash hole is still 0.029", which is what it was, when born......................wonder what it will be next year about this time.
I am sure it will probably be there in another 299 shots very easily... but the point you are missing and do not grasp is that the design of the inverse cone really aids in the survival and the lasting ability of the liner and the breech plug.
The vortex of the gas up against the dome is defected away from the center of the vent liner and aids in reduction of the amount of gas that runs back up the breech plug. That little bit of deflection and time allows the sabot and/or projectile to clear the barrel and suck some of the left over debris out the barrel with it.
It is not all about just going boom. If you were to look into the dynamics of the gas expansion, escape, and the timing of the exit of the bullet from the bore you would understand more from where I am trying to explain.
Another way to test it, and I have no idea how you might do it.... put a pressure sensor in the flash channel , record the pressure with a regular BP, then with a flat liner, and finally with the domed liner. you would see less pressure with the domed liner... add that a flash channel that is longer, or that can hold more volumne and the pressure would be reduced again... which leads to less debris and fouling in the breech plug.
It did take you a while to see the advantage of the larger flash channel also but I think you now agree that opening the channel is an asset.
I think we have somewhat the same disagreement on the length of the BP, even when shooting BH. The powder pocket is not needed to ignite BH and it certainly is not a detrement but in my eperiance I have better luck and reliabilty going the other direction. Most of my Knights are equipped with what I call a Gen III plug, they do not fit into Western design plan at all or even yours, but they function amazingly well in all conditions.
Since modifiying the Triumph plug with a vent liner on the nose and 0.159 flash channel, it also has function with zero problems, but in all honesty I have tested it extensively... Then I am sure that Lee (lemoyne) modified his the same way and I know he has tested his a lot...
So it continues a difference in thoughts (i can not spell the big word) which is great - that what makes the world go around.