Some time ago i modified the powder end of my Accura breech plug so that it looks more like the Omega breech plug. This was done, because when using BH209 and W209, i had experienced a very few hang fires and one no fire whilst preparing for last hunting season. Sabotloader provided information on installing a vent liner, and i was able to get the job done.










The deeper concavity that was introduced seems to help; since making the modification there have been zero ignition problems. However, after firing the rifle so many times the primer seat started to erode, and this flame cutting became worse and worse with use. To fix this issue, i utilized information provided by Busta, and prepared the plug to use o-ring under the primer.









The o-ring totally eliminates all blow back, and cured the flame cutting of the primer seat.

Yesterday, went up into the hills to shoot the rifle off a walking stick, to practice for this next hunting season. I thought i could test whether a 777 primer would ignite BH209 with this breech plug, but i couldn't find any of them around the house, so i figured i would just try some vara-flame chingadero with small rifle primer. The rifle wouldn't light the primers at all. This, for some reason, disturbed me. When i came home, i decided to use information provided by Screwbolts and modify the primer seat with a grade 8 bolt. The grade 8 bolt allows one to redo the primer seat, and eliminate the o-ring. Before i could finish, wife wanted to drink beer, so i quit working on the breech plug.

During the night while we were sleeping, and i was dreaming of breech plug this fella walked through the back yard.









This morning i finished the breech plug.









After finishing the breech plug i went up into the hills and shot the rifle several times. First thing, i tried the vara-flame adapters, and experienced a hang fire, and 2 no fires. The rifle did ignite the primers today, but the small rifle primers weren't so very good at igniting BH209. Then, what with the hang fire, and the no fires, i started to flinch. That was the end of that, and i went to using the Winchester shot gun primers, after i kinda cured the flinch. The W209 were once again 100% reliable.

Good report Ron. I enjoyed the read (and the picture of that brute).

Great report and excellent pictures.

Do you have to replace the o ring for each shot. If so how fast could you get it out and get off a second shot in a hunting situation? I would think that o ring would melt pretty quick but it sure sounds like it got rid of your misfires with 209 primers. That is a beauty of a deer, is that pretty common in your area of South Dakota. I would love to hunt in the South Dakota area for pheasant and deer. Somehow I got a SD tourism guide in the mail and that is one beautiful state.

ronlaughlin

In the beginning I did the same thing - I sank the vent liner inot the plug to reduce the distance the flash needed to travel. Thinking this would really help the ignition of BH. This is a Knight plug that I converted using the Lehigh Vent Liner.



Even Dave @ Lehigh was convinced that reducing the length of the flash channel was the way to go.

After shooting his vent liner and then considering the length of the Triumph plug, which works very well by the way with BH, I wondered how important is it to reduce the length of the flash channel... IF you are using a Lehigh vent liner. After a lot of consideration I decided the added length of the flas channel was beneficial to reducing the 'felt' blow-back pressure on the primer and as in the Triumph hoping it would also reduce the amount of blow-back gas that might escape.

My reasoning was if the the 'flash Channel' could contain more blow-back volume and allow the bullet to get out of the muzzle - then on exit the gas would then be sucked out of the breech plug. Increasing the volume contained was the key - so by lengthening and drilling the flash channel to a larger diameter - I believe I have accomplished this.

Here is an example.... The Vent liner has been installed on the end of the plug, increasing the length of the 'flash channel' and the channel has been drilled with a #21 bit. Then to test the operation I shot 20 shots through the Knight using the normally really dirty Red Plastic Jacket and these jackets were used one on top of that.



Here is another look at it....



Moving to a NFPJ makes it all the more cleaner... This is a picture of a NFPJ with the vent liner installed on the end of the plug... The white substance you see on the bolt is lithium grease. I put the grease on to catch and trap blow-back material so I could see it better.



This is the operational theory of my conversion attempts...



I really should give creadit where credit is due... and that is the Lehigh Vent liner. The reversed cone effect of the vent liner forces a given amount out and away from the flash hole and into the barrel. The breech plug nor the liner act as a funnel directing the blow-back back up the flash channel.

The other effect of the vent liner... I use a W209 to ignite BH and have not had a problem at all. Actually I even use a cooler Remington 209-4 (410 primer) and Win T7 primer - all work equally well. I have shot 90 grains to 140 grains of BH with these combinations - The chrono shows no really difference in velocities with any of the primers, although the impact points move a little left and right - all provide excellent groups.

Maybe because of the different metals used in the Breech Plug - I have not yet seen any gas cutting on the Knights, Omega, or Remington 700ml plugs... Guess I am just fortunate.

deer655

The o-ring last 25 shot easily. The breech plug makes for reliable BH209 ignition with or without the o-ring. The o-ring advantage, is it is an easy way to reduce blow back to zero. Amazon sells this silicone o-ring which is what is pictured in the breech plug

We have watched that buck grow up. He is alive, because he lives here in the city limits. I have never seen one as big on Government land where i can hunt, here in South Dakota. Several Ranches charge money to hunt bucks; there may be bucks as large, on one of those ranches. I have seen a very few bucks as large in Montana. Years ago, we would see huge bucks along the Salmon River in Idaho.

When we were first married, we were forced to eat stinky tough deer. Wife won't eat buck ever since, and myself i like to eat deer, but am fussy about the meat. I have never hunted for big bucks, so i naturally am not one to ask about them.

From time to time i have wondered if i have experienced flame cutting of the primer seat, because i haven't been very diligent keeping the breech plugs and barrels clean...........just a thought.

The distance from the powder to the primer is certainly quite long in the Triumph.

The vent liner from Precision Rifle is what i have been using lately; with perfect results.

well over 2,000 rounds in my accura's factory plug and before i modded mine for an o ring, there was zero flame cutting. It makes me wonder if the "flame cutting" is actually just carbon build up thats a SOB to get out.

That picture shows what i and other consider to be 'cutting'. It doesn't look like a build up to me. Perhaps you don't get the flame cutting, because you keep your rifles cleaner than i do.

Excellant Report! and a Nice Buck Too!