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Tedward

Guide
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Posts: 506
Reply with quote  #16 
At the beginning you said you cleaned it. Did you test fire after cleaning it?
Reson I ask is a customer had the same issue after cleaning it. He had too much lube (paste not oil) in the bolt creating a vacume on the firing pin. Cleaned it, ran it dry and it worked fine.

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nobody

jager
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Posts: 78
Reply with quote  #17 
I test fired it after cleaning. I put 10 rounds down the tube to make sure it shot zero. it took 5 rounds to get it back to p.o.a. to p.o.i. I put a extra 5 thru it to make sure. I do not use grease on any AR plat form. I normally run them moist, not wet. I have put 1500 more rounds thru this rifle with out a flaw. I will never take it deer hunting again because in the back of my mind I will wonder if it will fire or not. I will stick to my custom .243(I custom built), .308(I custom built) or my .300 win mag I can hold a 5 inch group at a thousand with(I custom built. win no but a head shot all day any day every day). I have lost faith in the 6.5 Grendel because when it should have went bag it did not. I retired it to ar match shooting in our local balloon shot each month. if it goes click I have lost nothing, but it never has. in the back of my mind I know it could go click with no bang again when it really counts.
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Healer58

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Posts: 17
Reply with quote  #18 
I sent a fairly detailed response to many of these issues back in November that comes from "excess" COL....you may not realize it but it does and can happen to the best of us. COL may and will vary whether "factory" or your own made rounds. You can try a Wilson case gauge or or whichever suits your fancy but it will boil down to one issue almost every time...too long of a round. Dependent on you chamber dimensions, ie; standard (.125) vs Grendel II (.136) your rounds and COL will make a difference and as I mentioned in the November post it will "disconnect" your firing pin (actually it keeps it from contacting the primer fully because it can't reach it - too short) and even though your AR bolt/BCG appears to be in battery even a quick smack on your F/A won't in some cases allow it to get to full battery. If the (loaded) rounds are hard or difficult to extract from the chamber your round is in excess of COL for your chamber of your rifle about guaranteed this is more than likely the issue...

Have to keep in mind the primer and its cross section...sits below the case by a few thousandths...add together primer strike needs to be approximately (.010-.015) to activate the primer place the cartridge too long by a few thousandths and you're out of the bang of the primer...seems odd but it actually works reverse than what most think...if the case can't sit fully in the chamber it is sets the bolt out of battery and the result is no bang bang....  

Suggestion is to try reducing the COL (since you reload) by a few thousandths (.005) or so each time until it chambers freely and add .005 more reduction...then work your rounds to what you want...this is how I found the "sweet spot" and how the rounds were not by the book because of the "short leade" in my barrel.
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llamaboy

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Posts: 5
Reply with quote  #19 
In two of the cases where you had a misfire, you mentioned that the bolt did not extract the cartridge from the chamber.  This indicates that your extractor is not engaging the case rim, and this is where your problem lies.  If it was always the first round from the mag, your bolt is not getting enough force to completely close.  Closing the bolt using the bolt release can cause this on ocasion.  Otherwise, it's with the extractor itself - dirt, rough edges, too much spring pressure, etc.  These problems can cause a misfire with any cartridge in the magazine.
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