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Post by Typical171 on Apr 4, 2015 20:53:44 GMT -5
Well I waited 4 months for barrel from Luke but got busy this week and started to build it. I ordered a .392x.400 blank ( just contoured) I wanted to do the rest. I had came up with my own plug design with a 45 degree sealing surface. I did this for two reasons, one, was it increased the available amount of sealing surface by over 40%, over a squared shoulder type and the other is that the 45 degree shoulder should center better (not that thats a problem with others). All work on the BP and barrel other then the contour I did myself. I also took 1.5 in of the barrel and made a FF die. Waiting on a media blasting gun to put the finish on the barrel. I have a HS precision stock ready to be bedded. Just waiting to put the finish on the barrel so I can torque it down the bed the stock. Thanks Luke again for the great service. |
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Post by Deleted on Apr 4, 2015 21:00:52 GMT -5
Very interesting and nice work. Keep us posted as you progress.
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Post by mrbuck on Apr 4, 2015 21:06:18 GMT -5
That looks like some beautiful metal work !
Chris
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Post by Deleted on Apr 4, 2015 21:07:20 GMT -5
Very nice! So that's SAE, does that mean I can still use a JIC 37* if I'm in a pickle?  very nice work should work quite well. What diameter and pitch did you go with? |
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Post by Typical171 on Apr 4, 2015 21:10:59 GMT -5
Thanks, 9/16 X 18 on the BP
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Post by rambler on Apr 4, 2015 22:43:51 GMT -5
Thanks, 9/16 X 18 on the BP Excellent design on the breech plug! |
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Post by Deleted on Apr 4, 2015 22:46:35 GMT -5
Looks very nicely done...I've always wondered why bp's had a flat sealing surface instead of angled like a valve and seat in an engine....Good upgrade imo.....
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Post by Deleted on Apr 4, 2015 22:48:07 GMT -5
That's some fine machine work!
Looks great!
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Post by dannoboone on Apr 4, 2015 23:28:50 GMT -5
You machinist pro's are making this machinist novice
very jealous! Lately, every time I turn around, someone
is making a better mouse trap with the breech plugs.
Mighty fine bunch of machine work there.
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Post by jims on Apr 5, 2015 1:03:46 GMT -5
Nicely done.
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Post by Typical171 on Apr 5, 2015 7:15:12 GMT -5
Thanks for the kind words
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Post by dave d. on Apr 5, 2015 8:03:40 GMT -5
Great job can't wait to see the finish product and targets. Goodluck
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Post by Deleted on Apr 5, 2015 8:06:14 GMT -5
What material is the breech plug?
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Post by Typical171 on Apr 5, 2015 14:14:24 GMT -5
The BP is a prototype and is made from a 1in. grade 8 bolt, I will make the next one from 4140
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Post by Typical171 on Apr 16, 2015 11:48:34 GMT -5
I got a chance to run some rounds today to try it out for the first time. All in all I was happy with the way it all turned out. My BP is sealing good, not bulging the primers (using the .04 bushing) I am however getting a little blowback around the primer, nothing bad but will need to work on this with the next plug. I started out with 45g. then 49g. then 52g. of IMR 4198 to get on paper and to evaluate everything. After 3 shots and center things up a bit on paper and primers looking good as far as pressure I loaded 55g. of 4198 and made a 5 shot group. (195g. Barnes TSX FF). Speeds were: 2852- Loose fit 2916- Good fit 2872- Tad loose 2921- Good fit 2914- Good fit Then I made a 5 shot group of 74g. IMR 4895 using 200g. SST FF for about a 7/8" group. (all @ 100yd.) Am using just T/C anti-seize lube on there BP threads comes right out with no issues. No gas cutting anywhere. Speeds were: 2830-LF 2847-LF 2861-GF 2880-GF 2876-GF        |
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Post by rambler on Apr 16, 2015 12:32:18 GMT -5
That's looking really good. I wouldn't think you'd get any blow by at all?? How tight of a fit do you allow for your primer pocket?
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Post by jeff on Apr 16, 2015 13:33:05 GMT -5
I went to blow back control on lukes new plug with down sizing the bushing to .030 and a 5/32 flash hole which starts blowing again around 78gr h4198 and a 300 m/h. Otherwise all average+ loads seal fine. jeff~
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Post by schunter on Apr 16, 2015 14:04:27 GMT -5
Very sharp rig and great first outing.
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Post by mrbuck on Apr 16, 2015 15:06:42 GMT -5
Very nice looking set up . Looks like a deer killer to me !
Chris
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Post by dave d. on Apr 16, 2015 16:39:42 GMT -5
Awsome great job I love those 40's
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Post by tnhunter54 on Apr 16, 2015 16:50:05 GMT -5
I agree with mrbuck deer killer for sure. Very ice.
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Post by Deleted on Apr 16, 2015 18:02:54 GMT -5
Looks pretty good and tight with the 4895.
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Post by charles on Apr 16, 2015 18:05:08 GMT -5
How was the recoil ?
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Post by Typical171 on Apr 16, 2015 18:26:37 GMT -5
Thanks for the compliments. The recoil is ok, probably won't go with a brake. the fit for the primer was really good I thought. I could only load a fresh primer about a 1/3 of the way by hand. I wouldn't want the bolt trying to close any tighter then it is. I am looking at building anther plug with a better sealing surface for the nose of the primer. My next outing I am going to throw the .030 bushing in it and see what happens. Thanks for the tip Jeff. I will also swap bullets with powders (195 Barnes with 4895 etc.) to see if the Barnes shoot any better. I think its the nature of the SST to group better.
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Post by hemicuda on Apr 17, 2015 9:17:15 GMT -5
Wow! I love your ff sizer, you really went all out even with all index marks and the knurl is perfect! You could sure give me some pointers with the knurl-sometimes they come out great, other times so so. On my ff sizer I am using an arbor press so mine is in reverse of yours and I size Hornady mono-flex 250 which are even tough with an arbor press. I still like the forward sealing surface for the breech plug for myself. I know it is harder to do but is my personal preference. I make a slight reverse taper at the front edge and get great sealing. Mine is stainless steel, not sure what #, probably 304. It was just in the shop laying around. I also have a little leakage around the primer but very slight and since its a break-open I can get them out easily.
Where are you located? Send me a PM. I would love to kick some ideas around. I normally buy a barrel blank and do all the work myself as machining is my occupation (now retired) and will be machining until I die. Love it! I can see it is your hobby as well! Maybe occupation? Great work and design! I'm sure you will get it all tuned in! Jim
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Post by smokelessindian84 on Apr 17, 2015 10:30:02 GMT -5
Are you going to try some loads with Varget powder?
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Post by Typical171 on Apr 17, 2015 13:47:13 GMT -5
Are you going to try some loads with Varget powder? I don't have any varget although it would be interesting to try some. I know others have had good luck with it here on the board. |
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Post by Typical171 on Apr 17, 2015 13:48:48 GMT -5
Wow! I love your ff sizer, you really went all out even with all index marks and the knurl is perfect! You could sure give me some pointers with the knurl-sometimes they come out great, other times so so. On my ff sizer I am using an arbor press so mine is in reverse of yours and I size Hornady mono-flex 250 which are even tough with an arbor press. I still like the forward sealing surface for the breech plug for myself. I know it is harder to do but is my personal preference. I make a slight reverse taper at the front edge and get great sealing. Mine is stainless steel, not sure what #, probably 304. It was just in the shop laying around. I also have a little leakage around the primer but very slight and since its a break-open I can get them out easily. Where are you located? Send me a PM. I would love to kick some ideas around. I normally buy a barrel blank and do all the work myself as machining is my occupation (now retired) and will be machining until I die. Love it! I can see it is your hobby as well! Maybe occupation? Great work and design! I'm sure you will get it all tuned in! Jim PM sent, I live in Missouri |
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Post by Deleted on Apr 17, 2015 16:51:13 GMT -5
Varget works great boosted with SR4759 for myself and N110 for others. As a single H or IMR 4895 will be a better powder then running straight charges of Varget. 10x works well also as a single or boosted. You have a good many powder choices. Have fun.
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Post by Typical171 on Apr 17, 2015 16:54:52 GMT -5
Varget works great boosted with SR4759 for myself and N110 for others. As a single H or IMR 4895 will be a better powder then running straight charges of Varget. 10x works well also as a single or boosted. You have a good many powder choices. Have fun. The last I saw of your .40 shooting H4895 you were around 70-72g. Did you ever go any higher and with the 4895 load? Also do you have a feel for were your at with pressure? |
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very nice work should work quite well. What diameter and pitch did you go with? 
