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Old April 20, 2012, 03:53 PM   #1
cah1256
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Alliant AR Comp

Need some help. I've been using H-335 form my Bushmaster .223 (typically 55 gr. bullets. Recently read the Feb. article in Handloader magazine about AR comp powder. The author used 25.6 gr. of AR Comp and Federal small rifle primers with a 55 gr. Hornady bullet. I thought I'd try the load, but upon dumping the first charge, I noticed the case was filled up to the case mouth (compressed charge). AR Comp is a fairly small stick powder so it makes sense that it will take up more case volume. Question? Is this a dangerous load? I've been reloading for 30+ years, but mostly pistol. I'm new to bottle-neck rifle loading. I've had fairly good success with H-335, but found accuracy lacking. Any help would be appreciated.
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Old April 20, 2012, 04:00 PM   #2
Striker1
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Are you using a reloading manual? What was your starting charge?
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Old April 20, 2012, 04:05 PM   #3
cah1256
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I use the 44th edition of the Lyman manual. This was a load tested in Handloader magazine. The author was using a Ruger mini 14. Accuracy was exceptional (according to him). Velocity was in the 3000 fps range. This is my first use of Alliant AR-Comp.
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Old April 20, 2012, 04:09 PM   #4
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You could go on the Alliant web site and check out their load data for AR Comp.
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Old April 20, 2012, 04:28 PM   #5
moxie
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Per the Alliant site, 25.6 is the MAX load. Starting load should be 10% lower, or 23 gr.
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Old April 20, 2012, 04:45 PM   #6
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They don't mention a compressed load do they?
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Old April 20, 2012, 04:47 PM   #7
cah1256
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You're right, went to the Alliant website. That's the load shown. I thought they might show it as a compressed charge. Iknow the Lyman manul usually does. Thanks for the help.
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Old April 20, 2012, 04:54 PM   #8
cah1256
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I submitted my question on the Alliant website. Awaiting a reply. I'll post it as soon as I get it.
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Old April 20, 2012, 05:08 PM   #9
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Thanks.

The are using a specific bullet, case and COL which may be different than the writer in the magazine article...could affect the charge characteristics as far as volume?
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Old April 20, 2012, 10:26 PM   #10
Arizona Smithshooter
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I am using the same powder. I wrote to Alliant and asked their recommendation for my M&P 15 using a 55 grain bullet. They said to reduce the published load by 10%, so I am using 23 grains. The cases fill to just below the neck of the case. I am getting very good accuracy, but I have no idea of the velocity. The spent cases eject the same distance as factory ammo. I was using Reloader 10X, but I am having trouble finding it for some reason.
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Old April 21, 2012, 07:18 AM   #11
moxie
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For a relatively light bullet like 55 gr., RE-7 or RE-10X are more suitable than the AR Comp.
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Old April 23, 2012, 10:34 PM   #12
bfoosh006
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He may have been using a drop tube...http://www.hornady.com/store/Extende...e-Clear-1Each/

Not the best example , but they do work.

Here is another example...http://www.youtube.com/watch?v=bB37W5NbOQg

The longer the better job it does..
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Old April 23, 2012, 10:55 PM   #13
mehavey
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My experience/recommendation is to bypass a drop tube. In fact I've never used one/never had to.

I discovered early in my blackpowder cartridge days using 1-F black that I could drop the powder levels in a
full straightwall case by an easy 1/4" just by holding the case in one hand (thumb over mouth) and
spinning the plastic powder funnel lip against the case wall a few times.

The corners of the lip would vibrate the case/powder down considerably.

For the last few years I've used the vibration from one of those inexpensive engraver hand tools

They settle powder instantly.

Last edited by mehavey; April 23, 2012 at 11:03 PM.
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Old April 23, 2012, 11:05 PM   #14
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I wonder if the OP ever heard back from the manufacturer???
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Old October 24, 2013, 01:47 PM   #15
sg372
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engraving tool

I have used the engraving tool after reading about it from mehavey on this website. It works great when using varget and 77 gr bullets.
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