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Post by roadking on Apr 27, 2017 21:13:56 GMT -7
I was wondering if you could help me out with a issue i'm having with my 9mm carbine. I think all that is needed is the chamber needs to be reamed. When a round seats in the chamber under bolt pressure it crimps, roll crimps, the round. Since I saw the quality of work you did on your barrel I thought I would ask.
Nice work!
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Post by jmglasgow on Apr 27, 2017 21:19:44 GMT -7
Most semi auto pistol rounds headspace off of the case mouth. It sounds to me like your headspace is too short, and needs to be checked with some gauges.
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Post by roadking on Apr 27, 2017 23:17:19 GMT -7
Absolutely correct, that is my concern. The crimp is so sever that I question the reliability and then the accuracy of the fired round. Another thing that makes me think it is a chamber size issue is that the crimp only occurs on approximately 40 to 50% of the rim. Not sure how that is possible without cnc machined being out of wack. And I don't know enough about how the chamber is made, but I doubt is made with anything else but a bit on a lath. Given my limited experience on what it takes to mill a chamber.
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Post by Admin on Apr 28, 2017 4:01:40 GMT -7
Can you remove the barrel and have a cast made of the chamber. That would let you see if your chamber is cut correctly.
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Post by roadking on Apr 28, 2017 9:36:59 GMT -7
I think that is the best way to approach this. Yes, very easy to remove barrel and get to chamber.
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Post by kevinu on Apr 28, 2017 10:51:52 GMT -7
What velocity are you getting with the 115 DTacs Thanks in advance 2910 |
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Post by spartan260 on Apr 28, 2017 11:18:16 GMT -7
I was wondering if you could help me out with a issue i'm having with my 9mm carbine. I think all that is needed is the chamber needs to be reamed. When a round seats in the chamber under bolt pressure it crimps, roll crimps, the round. Since I saw the quality of work you did on your barrel I thought I would ask. Nice work! I would recommend consulting with a professional, I'm just an idiot with a lathe in my garage. That being said, check the depth of your chamber by putting an average length unloaded case into the chamber (.746"). The case should protrude .125" +- a few thou. That will tell you if the chamber is cut to the correct depth. If that is correct then you have another issue. If that is not correct then you probably need, at the very least, the chamber recut. Again, probably best not to take advice from me, but good luck, hope you can get it figured out. |
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Post by griffith187 on Apr 28, 2017 19:47:17 GMT -7
What velocity are you getting with the 115 DTacs Thanks in advance 2910 That's really good velocity I'm just started to do some load development and I am getting about 2945 out of my 6-250 using 37 grains of H-4350 |
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Post by jc91087 on Apr 28, 2017 21:44:39 GMT -7
This is really impressive that you did this all yourself. Hell, I feel accomplished when I'm simply able to hammer in a rear sight on my Glocks.
Real nice work.
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Post by spartan260 on Apr 29, 2017 8:11:18 GMT -7
Thank you.
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