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Post by dave173 on Feb 29, 2016 22:01:58 GMT -8
Built my first 6.5C with DPMS upper/lower Creighton 24" bull barrel nitro boron bcg from Fulton armory could not get to cycle called Fulton and they told me they sometimes were having that problem and we're thinking of getting high pressure bolts for their bcg I could try that or send them my rifle at my expense and they would check it but it was probably bad lot of ruger ammo called ruger and they basically said BS bought a high pressure bolt from Ruger City Armory problem solved gun cycles perfectly now my question is if you know there is a problem why ship products without correcting them
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Post by devildogandboy on Mar 1, 2016 3:23:52 GMT -8
how does a "high pressure" bolt resolve the cycling function? wouldn't the dimensions be the same? just curious.
Bruce
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Post by GLSHOOTER on Mar 1, 2016 6:42:46 GMT -8
That is pure unadulterated BS. High Pressure bolts have nothing to do with operation. Plain and simple you got a bad bolt dimensionallly.
Greg
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Post by dave173 on Mar 3, 2016 15:27:11 GMT -8
Greg what area of the bolt would be out of specs on the bolt? it was a milspec bolt in bcg when I took it apart there seemed to be a lot of play around the firing pin. is it possible I was getting preasure blow back through the bolt causing it not to function? I'm still trying to figure out why it didn't work Thanks Dave |
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Post by GLSHOOTER on Mar 3, 2016 16:14:23 GMT -8
Greg what area of the bolt would be out of specs on the bolt? it was a milspec bolt in bcg when I took it apart there seemed to be a lot of play around the firing pin. is it possible I was getting preasure blow back through the bolt causing it not to function? I'm still trying to figure out why it didn't work Thanks Dave Dimensionally the only thing that could be wrong that could cause a problem is a bolt that was so fat it wouldn't go back and forth inside the BC easily. I had that on a 7.62 bolt years ago. Other than that that is it. Reliable cycling normally will never be effected by the material of the bolt provided it isn't broken that is. You talked to some one that didn't know squat. Perhaps if you had shot the bolt more it would have broken in" as many rigs might take 50 rounds of that BCG moving back and forth to run right according to some. Personally I have over 30 uppers and have never had one that had to be "broken in". Just make sure they are nice an wet initially and you are usually home free. Greg BTW I would call DPMS Warranty. Tell them that you replaceed their bolt with another brand and the gun runs. I would request that they let me return the original for replacement. |
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Post by dave173 on Mar 4, 2016 17:06:49 GMT -8
Greg The bcg came from Fulton armory and it was their suggestion to get the high pressure bolt we had fired I box of 120 hornady and and 10 rnds of 140 hornady before I called it quits for the day I cleaned the bore before shooting the gun and made sure the bolt was wet before we fired then wet it down again at the range trying to get it to work even pulled the float tube and made sure the gas tube was aligned correctly don't know where they get their bcg's Dave |
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Post by GLSHOOTER on Mar 4, 2016 18:04:27 GMT -8
Time for another chat with Fulton then as you have it running.
Greg
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Post by dave173 on Mar 5, 2016 2:13:56 GMT -8
Greg had that. they want me to send the bolt back so they can check it. I do have another question there seems to be two chains of thought on head space on each bolt, I have the go no go gages but it seems to me all that tells me is if the chamber is correct or does it tell you more Thanks Dave |
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Post by GLSHOOTER on Mar 5, 2016 6:22:27 GMT -8
Greg had that. they want me to send the bolt back so they can check it. I do have another question there seems to be two chains of thought on head space on each bolt, I have the go no go gages but it seems to me all that tells me is if the chamber is correct or does it tell you more Thanks Dave There is only one head space dinesion, + or -, on a true 6.5 Creed and only one depth dimension on a 308/CREED bolt head. All a HS gauge will tell if your bolt/chamber combination are within specifications. Personally on most builds they are a waste of money unless the gauges were done by the same reamer company. Greg |
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Post by Creedmoor love on Mar 6, 2016 4:08:20 GMT -8
Greg had that. they want me to send the bolt back so they can check it. I do have another question there seems to be two chains of thought on head space on each bolt, I have the go no go gages but it seems to me all that tells me is if the chamber is correct or does it tell you more Thanks Dave Headspace gauge will only measure the distance between the bolt face recess and the cartridge shoulder, in this case. It doesn't measure the chamber neck or barrel throat dimensions, or even the relationship between barrel extension and bolt lugs beyond how they affect that distance from the bolt face to the chamber shoulder. Remember, we are dealing with non-standardized 308 pattern rifles, here. I have only made hard comparisons between Rock River LAR8 and DPMS LR308 bolts and extensions.
Also, because the gauges have to be made solid from hard steel, they have to be turned smaller (ever so slightly, because it will not flex the way a brass or thin "softer" steel case) than cartridge specs, so they won't even measure if the chamber diameter is correct. They are really only good for that single length measurement.
Any one of these dimensions that are not measured by headspace gauges can affect reliability and safety.
To the original question about this "high pressure" bolt, GLSHOOTER nailed it when he said "That is pure unadulterated BS." The differences on a high pressure bolt are a wider extractor and smaller firing pin hole. The original issues had nothing to do with the extractor slipping off of, indenting, or ripping through the case rim, or with primers flowing into the firing pin hole. Using a normal spec bolt wasn't the problem and using a "high pressure" bolt wasn't the solution. Besides that, the Creedmoor is no more "high pressure" than its .308 predecessor, Saami maximum for both cartridges are exactly the same at 62,000 psi, and to the best of my knowledge they share case head and web specifications.
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