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OLinAZ
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Posted: 2/7/2012 5:10:30 PM
[Last Edit: 2/7/2012 5:47:03 PM by OLinAZ]
I bought a lb of AR-Comp to try with several bullets. Unfortunately, there is almost no load data available (that I can find). Alliant's web page lists 1 load for 3 bullets but does not indicate whether they are starting loads or max etc. Their information does say that the burn rate is almost identical to VARGET.

Does this mean that I can safely use VARGET load data from the companies manual for the bullets I want to use?

Comparing the data from Alliant's web page to several loading manuals confuses the issue because the VARGET max loads from the manuals are significantly higher than what is listed on the web page.
RedFalconBill
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Posted: 2/7/2012 5:19:21 PM
AR-Comp is a temp. insensitive version of RE-15.

The data I have are maximum loads.

What bullet are you looking for?
OLinAZ
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Posted: 2/7/2012 5:36:46 PM
AR-COMP is a temp insensitive version of RL15, but according to Alliant's web page it is closer to VARGET due to the changes to make it temp insensitive.

From 'Accurateshooter.com' Article:
"Burn Rate Like Varget: Though this is a reformulation of Reloder 15, the burn rate of AR-Comp is slightly faster than Reloder 15. Alliant told us: “Reloder 15 is slightly slower, in burn rate, than Varget. The new AR-Comp, with the enhancements, ended up slightly faster than Reloder 15, so it is now very close to Varget in burn rate”. This is the result of the “tuning” of the powder to be much less temp-sensitive."

I am wanting to try Sierra 69gr HPBT MK, 77gr HPBT MK, Nosler 69gr HPBT CC, and Nosler 60gr BalTip w/cann.
RedFalconBill
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Posted: 2/7/2012 5:46:56 PM
The Sierra bullets are on Alliants website. You can substitute Sierra data for the Nosler Match Bullet.

You can reduce by 1.5gr and use the 55gr Sierra data for the 60gr Nosler Partition.

Since these are maximum loads, reduce by 10% and work up.
dryflash3
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Posted: 2/7/2012 5:49:09 PM
I have worked up some loads in my 1 in 9, 16 inch AR using Sierra 69 gr SMK and AR comp.

Using the info at Alliants site, I started at 22.5 grs, went to 23.2 grs, then 23.5 grs.

10 shot groups with the last 2 loads were just over an inch at 100 yds.

My load, Speer 08 case, 69 gr Sierra MK, PP uniformed, trimmed to 1.753. Rem 7 1/2, OAL 2.250, no crimp.

No pressure signs in my rifle.

Good luck
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OLinAZ
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Posted: 2/7/2012 5:51:07 PM
Thanks for the replies.

Have you tried these loads yourself? If so, how was the results? They seem to be really low powder charges. They are 2 grs lower than the RL15 max loads.
dryflash3
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Posted: 2/7/2012 6:08:41 PM

Originally Posted By OLinAZ:
Thanks for the replies.

Have you tried these loads yourself? If so, how was the results? They seem to be really low powder charges. They are 2 grs lower than the RL15 max loads.

If you mean me, yes shot in one of my AR's on 1-28-12.

I worked up to Alliants max listed load.

I'm not worried with Re-15 charges.

The same day, CFE223 shot the same bullet much better.

More testing of these loads is in my future.


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RedFalconBill
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Posted: 2/7/2012 7:02:29 PM

Originally Posted By OLinAZ:
They seem to be really low powder charges. They are 2 grs lower than the RL15 max loads.

The charges produce near maximum pressure (53,500 to 54,500 psi).