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Post by 12ptdroptine on May 21, 2015 17:31:44 GMT -5
Please enlighten me on the reasoning behind enlarging the PFC to 5/32 . I am going to use the .30 bushing? I just want to make sure I am on track with my thinking. To have a larger area for the pressure to expand therefore lessening the pinpoint pressure asserted on the primer. Am I remotely correct?
Thanks
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Post by Deleted on May 21, 2015 17:41:01 GMT -5
IMO you are on the right track,but from what I've noticed is that the .040 bushing is where the enlargement of the PFC is being used because it is allowing more pressure to flow back toward the primer....I was starting to get stuck primers using my .030 bushing and when I pulled the plug I had fouling in the PFC, I cleaned with a drill bit and am good to go again.....
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Post by 12ptdroptine on May 21, 2015 17:44:24 GMT -5
What is the size drill bit to clean the PFC in the new Arrowhead plug?
Thanks
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Post by 12ptdroptine on May 21, 2015 17:54:49 GMT -5
My .40 cracked and I elected to go ahead and shoot it at the Kentucky challenge. After 5 shots I detected some pretty good pressure signs on the primers and a little soot ...totally unlike anything before. So I pulled the plug and the bushing then in had 3 cracks.....learned my lesson there. Got home and examined it closely it was in 3 pieces and even discovered that the bushing retaining set screw was cracked. So back in with a new .30 and some 620 retainer series Loctite.and wondering if I should open the PFC also. After finding all this I wont shoot a cracked bushing again. Lesson learned
Thanks All
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Post by Deleted on May 21, 2015 18:07:53 GMT -5
The flame channel in the new Arrowhead plug is 9/64"... I opened mine up to 5/32" before I first shot...Not sure if it was needed...insurance against primer bulging... .030 bushing...Someone posted they had primer issues at 9/64"... Maybe they'll chime in...Mine works great so far at 5/32"
Zen
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Post by Deleted on May 21, 2015 22:09:16 GMT -5
The larger PFC lessens the 209 primer damage in 2 ways.
First, In a load where the primer normally doesn't bulge, if you do see bulging, it's almost always the fact that the PFC is slowly filling with carbon.
So upon initial ignition, the larger PFC lessens the bulging that is created from primer itself.
The second way a larger PFC lessens primer bulging is the way you first described.
It increases the area the back flowing gas can fill into, and therefore lowering pressure that bulges the primer.
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Post by joe1379 on May 22, 2015 0:31:59 GMT -5
Well I made a post about two weeks ago mentioning the primers bulging in the new plug. I had cleaned out the carbon and shot again with no problems. However, today I was at the range and anything over 70 grains of 4198 would badly bulge the primers. There was a bit of fouling in the PFC, but very little. I opened mine up about an hour ago to 5/32 and will give it a go early next week. The bushing does not appear to be cracked when viewed from the top but this post makes me wonder. Gotta be something because many are using heavy loads with the new plug and no issues.
Joe
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Post by lwh723 on May 22, 2015 10:40:49 GMT -5
First run of plugs had a 9/64 PFC. Some people have seen bulging, some haven't. Going forward, I'm having them made with a 5/32 PFC.
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Post by Jon on May 22, 2015 22:54:08 GMT -5
Joe looking for your further reports. I really like Luke's plug. And for my use I like 209? If Jeff ever comes up with a module for 209's I will like to see how they work? I can understand why he is not in a hurry? That may answer some questions about lrmp compared to 209. Just from what I see if you stay 45 cal. he has the answer especially with thin skinned bullets. But if you get into Earnhhardts heavy for bore slow powders I think the his system has a problems?
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Post by bestill on May 23, 2015 0:26:28 GMT -5
Im a 209 shooter and also like lukes new plug. But for center fire action jeffs system hard to beat. After watching his 416 in action last Saturday. What problems are you seeing with his system?
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Post by joe1379 on May 23, 2015 9:41:44 GMT -5
I have spoken to Luke about this and I have one of the first run plugs. I think the smaller PFC is the problem and will test out the drilled version this week. I think the Plug is awesome but as with any new thing there will be little tweaks that need to be done. Prior to the PFC getting dirty I had zero issues with mine. I will probably buy another one from Luke just to have on hand also as I am a big believer in having back ups.
Joe
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Post by 12ptdroptine on May 23, 2015 10:30:44 GMT -5
Found some fouling in my PFC. Cleaned it and since I have.loctited.my new.30 bushing in. I had to come through the front of the plug to open the PFC. I left a very minute shoulder rather than hitting the bushing. Its opened to 5/32 now. Headed out to the range to try things out. Will post results soon.
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Post by joe1379 on May 23, 2015 18:50:24 GMT -5
I also drilled through the primer side when I opened mine up. I marked the drill bit so I didn't push against the bushing. Keep us posted on the results. Sounds like you will get to the range before me! I will need to fire up my bass boat to go to the range if this rain doesn't quit soon. Crazy
Joe
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Post by Richard on May 23, 2015 19:12:16 GMT -5
When you think about it, remember that the bushing is made of a harder material (pure carbide) than most all drill bits so going thru from the primer side and hitting it will simply just stop your bit in its tracks. A little shot of compressed air and/or one of your torch tip cleaners will remove any carbon dust that might have gotten into it. Been there and done that.
Richard
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Post by 12ptdroptine on May 23, 2015 22:19:24 GMT -5
Well I went to to the range today ...it was a work party day. So had to wait a couple hours.. To shoot ...so I helped awhile.mshooting wasn't as good as I was hoping for. I resized some bullets way to small..however it made for a good ignition test.mbullets were so loose that on some of them the weight of the Knight ultimate range rod would push them all the way down. A couple good groups started and then fliers..oh well like I said kinda glad it turned out this way for ignition tests. About as loose as you could get. I was shooting a duplex of 5/65 red dot and h4198. So it's gonna go off . Cut and dried. But on to the plug. Perfect primers. No bulging...no blowby...perfect seal. And no bushing cracks! Very happy with the results. Now going to knurl those bullets back up and resize....again...lol and back to the range maybe tomorrow...supposed to rain...but after the Kentucky swamp challenge I am ready...lol
Good shooting
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Post by Deleted on May 23, 2015 22:44:35 GMT -5
I think you are good to go Russ...
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Post by joe1379 on May 24, 2015 17:21:34 GMT -5
12ptdroptine, I am happy to hear the drilling worked out! Hope mine does the same.
Joe
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Post by 12ptdroptine on May 24, 2015 18:05:09 GMT -5
Bullets all knurned back up and ready to resize again . And maybe a trip to the range tomorrow between showers. Supposed to be up to 29mph gusts with 15 sustained. But at 100 yds shouldnt be a bad factor.beats sitting home
Deop
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