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Post by bestill on May 16, 2014 7:01:50 GMT -5
Im in process of building custom plug for knight mountaineer. Preliminary sketch ends up with dimensions of .700 x .090 flash channel ( distance from Large rifle primer face to .031 vent hole) . so then plug face would have .450 recess at depth of .500 for powder column. Need info thanks.
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Post by jims on May 16, 2014 10:48:01 GMT -5
Rossman or edge and a few others might be able to assist you.
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Post by bestill on May 17, 2014 20:42:07 GMT -5
Im in process of building custom plug for knight mountaineer. Preliminary sketch ends up with dimensions of .700 x .090 flash channel ( distance from Large rifle primer face to .031 vent hole) . so then plug face would have .450 recess at depth of .500 for powder column. Need info thanks. what the board think of these dimensions will it work properly |
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Post by ronlaughlin on May 17, 2014 22:11:29 GMT -5
Since you are posting in this forum, it implies you will be burning Blackhorn. Myself i have many hundred shots using lrp to ignite Blackhorn. My OPINION right or wrong is your dimensions will work. However, it seems to me the vent hole is a bit small. My experience with Blackhorn and lrp (268 shot in one plug, plus others) indicate the vent hole will never grow. One could start with 0.033"; perhaps larger. My experience with lrp, and Blackhorn kinda indicate the vent hole gets smaller, because of carbon, as one keeps shooting, as does the flame channel. The 0.7" flame channel length should be just fine. The diameter should work, but after many shots..? Will it close up; i don't believe it will, but it will definitely get smaller. Myself, i would start with a smaller diameter recess for the powder column. Say 0.375", the same diameter as a vent liner screw head. Depth seems deep, but it should work; perhaps it could be less?
Just the opinions of an old retired carpenter that likes to hunt.
If you are preparing to shoot Smokeless in your Mountaineer, disregard all of what i wrote; i don't have a clue.
So evidently you will mill the bolt to accept them adapters from PR bullet. Also you are going to make the neck, of the breech plug, some larger than the plug provided with the rifle?
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Post by bestill on May 17, 2014 22:39:51 GMT -5
Yup shooting142 gr blackhorn and 275 mh and want to test lrp. Im making custom breech and a primer holder (module) to fit fpj bolt assy that can be reprimed with 30/30 autoprime tool. I agree may drill to .035 after testing goes well. Only reason for deep recess was to keep flame channel short as possible. Thanks for info.
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Post by ronlaughlin on May 18, 2014 7:03:40 GMT -5
Myself, i don't believe the flame channel needs to be as short as some do. It seems to me most folk think the flame channel should be short because of the success of the encore/omega plug igniting Blackhorn. However i think a longer flame channel can be just as successful. My examples are the 100 or so successful QRBP i modified by installing a vent liner into a recess. Their flame channels were much longer than an Omega plug, and also the new made for Blackhorn QRBP. Those modified QRBP ignite Blackhorn 100% of the time, at least to my knowledge. I tested the plugs with the longer flame channel many many times by leaving the rifle loaded over night in sub-zero temperatures, and never ever experienced a delay or a fail. To me the success of the QRBP i modified, and the Omega plug is the recess itself. The small volume of the powder in the recess, seems to behave like a duplex load. Right or wrong , i have long thought the smaller powder volume in the recess makes it easier to ignite, and then the rest of the powder ignites.
There is one definite advantage of a longer flame channel when one is using shotgun primers, and that is the increased volume. This larger volume seems to reduce the pressure on the primer. This is important when using shotgun primers, however for one using rifle primers, it may actually be a disadvantage, or maybe not.
So your breech plug won't have the long neck like the nfpj plugs. That solves the dilemma i had in my mind. Your plug will look more like the fpj plug without the nipple?
Now, my next question is about the mh bullet. Wouldn't it be better for you to shoot a be bullet at the speeds achieved using Blackhorn?
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Post by bestill on May 18, 2014 7:15:37 GMT -5
We are getting2400 fps now with our load and took8 deer last season with match hunter at ranges from60yds to 336yds all dead in there tracks so performance great. We are getting moa accuracy to 500 yds .. we compete inline matches and high bc and accuracy of match hunter much better than can get from ballistic extreme especially wind drift.. is there a disadvantage to short channel with lrp.
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Post by jims on May 18, 2014 8:06:53 GMT -5
bestill: Off subject a bit. I can see how the MatchHunters would work for deer with their jacket size but are most of your shots lung shots or high shoulder shots. Just seeing how they do it they hit a major bone?
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Post by ronlaughlin on May 18, 2014 9:47:32 GMT -5
".. is there a disadvantage to short channel with lrp."
No, i don't believe there is.
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Post by bestill on May 18, 2014 12:15:39 GMT -5
bestill: Off subject a bit. I can see how the MatchHunters would work for deer with their jacket size but are most of your shots lung shots or high shoulder shots. Just seeing how they do it they hit a major bone? All high shoulder shots!!! |
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Post by jims on May 18, 2014 20:27:04 GMT -5
Thanks for the info.
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