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RE: Mustang/Blackhorn Issue Not Looking Good
That's a thought crb. But, what the heck, once you get the sucker in a lathe you may as well go all the way in one sitting.
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RE: Mustang/Blackhorn Issue Not Looking Good
ORIGINAL: Semisane ITEM - In my first try with Blackhorn in the Mustang using a .25 ACP breechplug and small pistol magnum primers I had delayed ignition on every shot and several failures to fire. ITEM - In my second try using a 209 breechplug and CCI 209 primers I had failure to fire with the first two primers I popped. The firing pin broke on the third try, ending the test. ITEM - I've fired 15 shots with Blackhorn and CCI 209 primers out of the Omega X7 with no ignition problems. FACT: The Omegabreech plug is slightly longerthan the Mustangplug. A very small difference, but still longer. FACT: The flash channel in the Omega breech plug is a lotsmaller than the flash channel in the Mustang plug. QUERY: What the heck is going on? Here are the two plugs - Omega on the LEFT, Mustang on the Right.  So, I got curious and did a little measuring. The measurements shown in the (amateurish) diagram below may not be exact, but they are pretty close. Note that the flash hole on the Mustang plug - though almost twice the diameter of the Omega plug - is almost four times longer. Now I'm wondering if I'll ever get Blackhorn to work well in the Mustang. Hey, maybe that's a good thing. :D and look at these Breech Plugs on page3 of the brochure your BP looks like it should work to me:  To me yours should work according to the pictures I see. I am going to ask you to do the following: 1) switch to some Federal or Winchester Primers and see if your problem goes away, 2) make sure your sabot is verytight, you should NOT be able to push it down with 1 hand 3) I wantyou to put your full weight into the ram rod once thebullet is down on the charge. I had these EXACT same problems with my Savage the first time I shot it and I was NOT compressing the charge tight enough. Chap |
RE: Mustang/Blackhorn Issue Not Looking Good
I would be interesting to see if just a primer change makes the difference Chap.
Maybe I should hold off modifying the breechplug until I do that. I was using the standard CCI 209s (not the magnums). I've been doing a little web browsing and apparently CCIs are on the low end of all the 209s with respect to flame temperature and gas volume. I did have a pretty good sabot fit and really leaned on the ram rod. |
RE: Mustang/Blackhorn Issue Not Looking Good
The flash hole is too long for adequateprimer flame to ignite BH209. I was in the gas industry for 38 years and my job was to engineer flow rates of orifices at various pressures. Its evident that the original design of the breech plug was tolimit blowback. However the design limits the pressure or flame reaching the powder.
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RE: Mustang/Blackhorn Issue Not Looking Good
So Rock Fish, if I were to drill a 1/8" flame channel from the primer end, I wonder how long I should leave the flash hole to maximize ignition yet minimize blowback? Right now I'm still inclined to go with Chap's suggestion and leave the plub along until I can try a hotter primer. If that doesn't work, I can start drilling the 1/8" flame channel a little at a time and see what works.
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RE: Mustang/Blackhorn Issue Not Looking Good
ORIGINAL: Semisane So Rock Fish, if I were to drill a 1/8" flame channel from the primer end, I wonder how long I should leave the flash hole to maximize ignition yet minimize blowback? Right now I'm still inclined to go with Chap's suggestion and leave the plub along until I can try a hotter primer. If that doesn't work, I can start drilling the 1/8" flame channel a little at a time and see what works. That's the way to go, trust me;) |
RE: Mustang/Blackhorn Issue Not Looking Good
Well, I think it would be a good idea to try either CCI Mag or federal primers, I really can not believe it will cure the problem 100% but it should help.
My ides on how long the touch hole should be is based on the fact that as close as some of us have been able to tell the Triumph and the Omega have in most instances for most people have been the best most reliable and most accurate with BH[ i certainly never shoot any half inch groups much less back to back before I started using it. they both have a touch hole that is right at .15 long since the guns that don't have the 1/8 inch flame channel to a touch hole that's that short are the ones that have hang and miss fires that and a tight fitting sabot and some wad pressure are the only obvious differences. So when you try the hotter primers be sure you also have a tight fitting sabot[ as long as it takes both hands to push it down it should be tight enough] and lean on it once when its all the way down. Then if it were me and it still did not work well with BH I would carefully measure and take it down to as close as is practical to .15. Just my thoughts on it. Lee |
RE: Mustang/Blackhorn Issue Not Looking Good
Semi
Just my opinion mind ya, but even with hotter 209 I do not think it would be reliable... That flash channel allows heat andflash to escape the primer and also creates sort of a vortex to pull moreheat and flash out and into the flash hole. If you look a White nipple Doc did it just the opposit, that is why the #11 cap is so reliable in a White ML... the flash hole is almost directly under the primer and the 1/8" flash channel is on the other side down into the powder... this really is effecient. but itis a bit dirty - not blow back but soot from the primers or caps... I would still probably try the hotter primer but I do worry about reliability especially as the BH-209 fills up the breech plug and it does not take long. |
RE: Mustang/Blackhorn Issue Not Looking Good
I hear `ya Lee, but surely the diameter of the flash hole comes into play also. Although the flash hole channelon the Mustang plug is 3.76times longer than theOmega plug,it's largerdiameter makes it a little more than three times in area (.035" in the Mustang vs. .020" in the Omega).
Does anyone know the diameter of the flash hole on the Triumph plug? |
RE: Mustang/Blackhorn Issue Not Looking Good
Semisane
They are real close, that's why I did not say any thing. On an unfired new breach plug for the Triumph a .30 pin gives a slip fit so I would say about .0325 of course after it fired a few times it may open up a bit. The breach plug in the Triumph has had about 25 or 30 pounds of powder through it and it is enlarged some when I put them side by side. It still is precision shooting so it will not be fixed. Lee |
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