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#5838370 - 07/19/15 12:09 PM Load development 18in ar
Cleric Offline
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Registered: 03/11/12
Posts: 2579
All lake city brass with cci primers








Sad part is I left my chrony battery at home frown


I am leaning towards 23.3....

What's odd was hogdgon has max load at 23.7 and there are some pushing to 24+

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#5838388 - 07/19/15 12:26 PM Re: Load development 18in ar [Re: Cleric]
FiremanJG Offline
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Registered: 12/16/08
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Loc: Wolfe City, TX
Very nice. up

I agree 23.3 gr looks the best.
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#5841640 - 07/21/15 04:38 PM Re: Load development 18in ar [Re: Cleric]
Buzzsaw Offline
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Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
I learned the hard way about chrono batteries too, I always carry a couple extra now..

What bullet and twist? I bet you can pull the 1 or 2 "flyers" tighter, Like your 23.3 load, a different bullet might bring the one stray up with the others

I love Varget
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#5841912 - 07/21/15 07:33 PM Re: Load development 18in ar [Re: Cleric]
tenyearsgone Offline
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Registered: 04/21/13
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Not bad, but try some IMR 4198 or CFE 223. I bet if you do your part there's a good chance those group sizes could be cut in half.

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#5842352 - 07/22/15 05:33 AM Re: Load development 18in ar [Re: Cleric]
kry226 Offline


Registered: 01/11/09
Posts: 4778
Loc: Germany
IIRC, my Varget load I worked up was 25.5 with 55 gr bullets, LC brass, and CCI primers as well, but I don't believe I was over any max load. confused2

I have since moved on to CFE223, but hope your find the node you're looking for.
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#5843214 - 07/22/15 02:31 PM Re: Load development 18in ar [Re: Cleric]
Cleric Offline
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This was with 77smk.

This ar is not a precision ar. It has just a basic ctr stock. I am going to load some more up and chrono this weekend hopefully

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#5844081 - 07/23/15 02:39 AM Re: Load development 18in ar [Re: Cleric]
okstatefan Online   content
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Registered: 01/26/13
Posts: 808
Loc: Forney, TX
I have to admit to not having a chrono and just building my loads on accuracy.

I also have to say that my favorite pistol (9mm, 45acp) and rifle (.223 and .308) are both coming out of respective CFE.

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#5937599 - 09/20/15 03:46 PM Re: Load development 18in ar [Re: Cleric]
Cleric Offline
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Got back out today....

Had some good luck with the 23.3 load. Had a 3 shot group that were touching at 100

Velocity avg was 2546, but the min was 2444 and max was 2607. That was on a 10 shot group.


I think the issue was my brass did not have an inner chamfer. I will test again on the next round with inner chamfer. That spread should be lower,
Some people are running up to 25-27 grains... I have no signs of pressure. I am wondering if I should push it harder or not. My range is only 200 so not super long

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#5947967 - 09/26/15 05:41 PM Re: Load development 18in ar [Re: Cleric]
Big Fitz Online   content
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Registered: 12/06/09
Posts: 2003
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I may be a bit confused, but Hodgdon's data indicates a 23.7 is compressed and 2700 fps. I can understand their velocity is likely from a 24" bolt action barrel but I can't understand why your velocities are so low or how others could be loading 25-27 grs. Am I misreading something?

Note, I am preparing to work up similar loads of 77 gr for my ARs so interested in learning from ohters' experiences.
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#5948310 - 09/26/15 09:57 PM Re: Load development 18in ar [Re: Big Fitz]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
I think you answered it, Tim.

24" vs. 18" = 120~ fps loss, using the 20 fps per inch of barrel rule of thumb.
Then there is the gas gun tax. Loss of velocity operating the bolt on the AR.

So if I get into loading my 16" AR with the same bullet and powder as Cleric I won't be surprised if I'm running 40 fps less than he is.
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#5948337 - 09/26/15 10:10 PM Re: Load development 18in ar [Re: Cleric]
Cleric Offline
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Brass type also will come into play for velocity

My loading wasn't the greatest as I had no inner chamfer I had some veloxity loss as a result

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#5948837 - 09/27/15 11:49 AM Re: Load development 18in ar [Re: Cleric]
Big Fitz Online   content
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Got it and thanks!
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Originally Posted By: syncerus
I prefer to think of myself as a control enthusiast. wink

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#5948861 - 09/27/15 12:00 PM Re: Load development 18in ar [Re: Cleric]
Cleric Offline
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Registered: 03/11/12
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I think after I shoot through my 77smk I am going to switch to the 75amax... A lot cheaper butler...

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#5949223 - 09/27/15 04:46 PM Re: Load development 18in ar [Re: Cleric]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
No, don't!!!

Then there will be less of them for me. peep
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#5960260 - 10/04/15 12:49 PM Re: Load development 18in ar [Re: Cleric]
Cleric Offline
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Went out again with same load. Got a good inner chamfer on the brass

20 rounds avg 2573, std dev 30, Es 127

A bit better need to work on varget metering to get a lower Es

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