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Griffin2006

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Reply with quote  #1 
I built my first Grendel this winter and am happy with MOA performance in the first 20 rounds after break in.  I Picked up a Liberty barrel from "Barrels on Hand" at Satern,  Telfon coated 18".   The rest of the rifle is good quality pieces parts I picked up from various vendors online.   I have a Prostaff 4-12 Mildot scope on it that's OK for my 67 year old eyes and I went with an A2 style stock.    Break in was with factory Hornady 123 SST's.   I then put some handloads through it which were 123 Amax,  Hornady brass,  28 gr IMR 8208, CCI BR4s load to a COL of 2.25.    Best group was 1.05 and worse was 1.50 at 100 yards  so, I calling the 1.0x groups MOA...   From elsewhere on the forum I have read that these barrels get better with the first few hundred rounds.   True?    I could really feel the stock trigger's gritty performance so last night I ordered a Geissele SSA-E from Trading Places Gun Range in Monroe GA.   Delivered, they are selling it for $209.  My first upgrade to the rifle and the first one I expected I would need.   

Now if I could get the benefit of your experience,   I am new to reloading as well as to the Grendel.    I measured my chamber and found that I am magazine limited with every bullet I've checked.    Is that what everyone has found with the Liberty barrels from late last year?   If someone is verses in accuracy and pressure effect of the jump from COLs of 2.25 to magazine limit,  I'd like to hear it.   

Thanks ahead of time for your advice on the Grendel and reloading for it.

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Borrego Bob

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Reply with quote  #2 
Sounds like you have a SAMMI chamber and not a Grendel II?
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Griffin2006

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Reply with quote  #3 
I don't have the equipment to do a reliable chamber measurement but I used a technique I saw online.    I took a 123 Amax bullet and seated it long in a case,  then inserted it into the chamber and locked the bolt in full battery.   I got a reading of 2.348 by checking land marks on the bullet using this technique.    I didn't think that a SAMMI chamber would be that long.   Correct me if I got that wrong.    

I do have a question about that chamber also.    If my measurement is correct, I will have about .050 jump seating that bullet to magazine limit.    How will that effect accuracy?   I've read that you want more like .015.
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Borrego Bob

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Reply with quote  #4 
Yeah sounds like a Grendel II the jump is general and different bullets like and jump and others don't. The 123gr SST tolerates a jump as people are getting good results with factory ammo loaded to 2.245in. You loads will be a little different than those loading for a sammi chamber but will probably be very similar. The jump chages the accuracy node a bit. If you want to load right off the lands take a look at the 120gr Nosler BT. 
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“What’s the secret of success? Right decisions. How do you make right decisions? Experience. How do you get experience? Wrong decisions.” – John Wayne

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Griffin2006

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Reply with quote  #5 
Received my Geissele SSA-E today from Trading Places Gun Range.   Very easy install.   I've done several AR trigger installs but never thought to use a dummy pin to hold the disconnector in place for install.    Comes with the Geissele kit.    The Trigger pin pushes the dummy pin through with the easiest trigger install ever.   Anyone got advice on the grease they send with it.   I've never greased an AR trigger.
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Trevin

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Reply with quote  #6 
Grease is for the sear surfaces. He made a series of install videos for the SSA.  The third (linked below) talks about lubing it.

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Griffin2006

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Reply with quote  #7 
I'm past the first 500 rounds from my Grendel and was expecting to be consistently at MOA or less by now.   I'm getting mostly 1.5 to just under 2.0 MOA.    My Grendel is one of Satern's Teflon coated 18" Liberty barrels on a mil spec forged upper and lower,   SSA-E Trigger,  A2 Stock, Nikon Prostaff glass on a Rock River mount.  I went over it this weekend to ensure that I didn't have something with the gas system, scope/mount or something loose - nothing noteworthy found.  The bore is pretty hard to clean so I'm considering running a series of Tubb Final Finish abrasive rounds down it.   Wondering if anyone on the forums has used the product with Liberty barrels and found any difference in accuracy.
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Borrego Bob

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Reply with quote  #8 
Theres a thread on it i used some and it worked and so did one of the other guys. 
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“What’s the secret of success? Right decisions. How do you make right decisions? Experience. How do you get experience? Wrong decisions.” – John Wayne

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