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6.5 grendel

 
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  #1  
Old 01-29-2014, 01:21 PM
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Join Date: May 2013
Location: wyoming
Posts: 10
6.5 grendel

hello everyone


I just finished building a 6.5 Grendel. iv been working on some test loads to achieve maximum accuracy and performance so far I have tried 120gr Hornady a-max with 26GR of H335. they shot alright, they held a group within .75in at 100yds. I tried to load a batch of Hornady 129gr interlock. I used the same powder charge 26gr H335 and apon shooting them and inspecting the brass the primer had a small hole punched deep inside it and there was a large crater from the firing pin. I have never seen this before and I am not sure what the cause is. I know its from pressure but im not sure where its coming from. all my brass have had the same small mark on them about .25in down from the neck and I have not been able to fix it yet. I am hoping that maybe someone has seen these same issues and was able to fix it. im not sure if its from the loads I have been running on some were in the gun if anyone has an idea or has found a better load. the barrel has a 1-8 twist and i havnt found any load data for a Grendel with a 1-8 twist im hoping i just havn't been looking in the right place or someone has some info.

thank you Robert.
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  #2  
Old 01-29-2014, 05:45 PM
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Join Date: Nov 2011
Location: Southwest Virginia
Posts: 121
Re: 6.5 grendel

I'll venture a guess. You have too much powder in the case for that weight bullet. Hodgdon load manual states a max load for the 123 AMAX as 28.7 grains of H335.
Hornady's latest manual lists 26.4 as max with the 120/123 AMAX. I don't have data for the 129, but in such a small case I would think you should back down to 21 grains of H335 and work back up. Also another choice would be to go to a slower powder like varget or CFE223.
I will say that I have not experimented with the 129 or H335 so I can't directly answer from experience. Also, I apologize if you did work up to the 26 grain level with the 129, you just didn't indicate that you had.
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  #3  
Old 01-29-2014, 11:31 PM
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Join Date: May 2013
Location: wyoming
Posts: 10
Re: 6.5 grendel

Quote:
Originally Posted by 112Savage View Post
I'll venture a guess. You have too much powder in the case for that weight bullet. Hodgdon load manual states a max load for the 123 AMAX as 28.7 grains of H335.
Hornady's latest manual lists 26.4 as max with the 120/123 AMAX. I don't have data for the 129, but in such a small case I would think you should back down to 21 grains of H335 and work back up. Also another choice would be to go to a slower powder like varget or CFE223.
I will say that I have not experimented with the 129 or H335 so I can't directly answer from experience. Also, I apologize if you did work up to the 26 grain level with the 129, you just didn't indicate that you had.
your right I did not clarify. that was my starting point the only load data I found for the 120 Amax was low of 26 and a high of 28.5 and for the 129 I saw 26 to 29 but I don't know how much was correct so ill probably drop my starting point to 21 or 22. thank you for your help

Robert
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  #4  
Old 02-01-2014, 09:56 PM
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Join Date: Mar 2009
Location: NW WI
Posts: 158
Re: 6.5 grendel

I think for the 120-129 you are much better off using powders like 8208XBR, AR-Comp, CFE 223, or Leverevolution. Leverevolution is pretty available and from my rifles is both accurate and very fast.
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