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Reloading Berger Bullets


If you need a good .357/.44 Mag powder, try AA-4100

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Unread 02-06-2013, 01:52 PM
Silver Member
Join Date: Nov 2012
Location: Western NC
Posts: 135
If you need a good .357/.44 Mag powder, try AA-4100

I just wanted to post this, as I had never really heard much about this powder till I just tried it myself.
I have a S&W M686 6" in .357 Mag, and a S&W M629 4" in .44 Mag. Normally, when I buy powder for my magnum pistol loads, I usually use Alliant 2400, and when I can't find it, H-110, N-110, or W-296 is usually backup...

Well, it seems our "elected official" has everyone scared to death, and people are buying up everything they can find. All of the shops I buy powder from within a 2 hour raduis were all out of the aforementioned powders.
Well, I started looking through my burn rate charts looking for a reasonable alternative, and noticed that one store had several pounds of AA-4100 in stock, and according to my burn rate charts, it is usually listed as a little faster than 2400, but a tad slower than H110. Accurate Arms describes it as being slightly slower than AA No.9, and that No.9 load data can be used for 4100, while increasing 3% for the slower burning 4100.

I bought this, and loaded a hundred rounds in .357, varying charges and using 158gr. Hornady XTPs and 125gr. Winchester JHPs. WOW! My 686 grouped some of the best groups it's ever shot, and I've even increased the load to match my top velocities with 2400 and 110, and getting better groups! Also, I'm not having to use magnum primers either, as I did with H-110 and W-296.

I've not had a chance to test my .44 Mag loads yet, I've got them ready to go with 240gr. JHPs. I'll post back when I get the results.

All in all, I am going to stick with this powder completely- at least for my .357 Magnum loads! And here's the best part - at my shop, 4100 is about $6 cheaper per pound than H-110 and $9 cheaper than N-110!
"It can be - done quickly, done correctly, or done inexpensively ... Pick any two."

"A government big enough to give you what you want, is strong enough to take what you have." -T. Jefferson
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Unread 03-14-2016, 05:25 PM
Junior Member
Join Date: Nov 2010
Location: Westside, Washington state
Posts: 15
Re: If you need a good .357/.44 Mag powder, try AA-4100

I want to give this powder a try in my 41 magnum Ruger.

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Unread 03-15-2016, 12:45 PM
Junior Member
Join Date: Nov 2002
Location: south east Sask.
Posts: 16
Re: If you need a good .357/.44 Mag powder, try AA-4100

I am curious about this in 41 also, let us know how it works out.
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Unread 03-15-2016, 02:58 PM
Platinum Member
Join Date: Jun 2010
Location: greenwood, IN
Posts: 4,057
Re: If you need a good .357/.44 Mag powder, try AA-4100

In the 44mag and heavier bullets; I can recommend AA#9. Not the fastest, but seems to have a little less recoil. Have not tried the 4100, and it might be too fast for 250 grain+ bullets. Yet I also use #7 and #5 in my 45LC revolvers. The 4100 might be the bridge I've been searching for. #9 is a slight bit too slow, and #7 is very good. Still looking for something ever so slightly faster. I'll give it a try.
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