AA-5 Loads in 38 Special are HOT!

papajohn428

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I've used Accurate Arms #5 for many years with complete satisfaction, and when other powders were hard to find a few months back, I grabbed several more pounds of it to use in my 38 loads. I train with Plus-P ammo because I want factory-level performance when I train, so none of my loads are wimpy. The bullets I used were standard cast 158-grain SWC's, made by a commercial caster, and I've been buying them for a dozen years or more. I consulted a dozen different reloading manuals, including those put out by Accurate as well as a few others. Most showed a maximum load of around 5.5 grains, though an older AA pamphlet showed a max load of 6.0 grains with a 155-grain lead slug. I settled on 5.2 grains as my load, and made up several batches of them, around 2,000 rounds altogether, loaded on cold snowy days when there was little else to do.

Imagine my surprise when I finally got to the range, loaded up six rounds in one of my trusty S&W M-64's, and rolled back the trigger.

BLAM! Wow, that was kind of um, warm. Let's finish out the cylinder-full, that first one must have been old, work-hardened brass.

But no! They were ALL like that, hot as hades and downright scary to shoot. After examining the primers I decided they were a bit warmer than I liked, and given that my shooting hand was throbbing from the pounding (even with Pachmayrs), I retired my M-64 from the activities, and ran them through my 686. They were still not real pleasant to shoot, certainly close to magnum-class rounds, though the primers didn't look all that alarming. No cratering, just more squared-off than normal.

Upon reviewing my records, I discovered that due to a local primer shortage, I had bought a couple bricks of W-W Small pistol MAGNUM primers, and used them when I had nothing else to load 38 brass with. I've substituted mag primers in 40S&W before and saw almost no change in velocity or felt recoil, but I think I got a hot batch of AA-5, and the mag primers only exacerbated the problem.

I rarely load to the maximum, and thought in this case that the load would be totally normal, I've shot many thousands of rounds in the 90-95% range with no issues, but these loads are downright painful to shoot from the 64's, and I have relegated them to use in my 686 and GP-100 ONLY, I'm convinced that even as sturdy as my 64's and 65's are, these are just too rich for their blood.

Having shot up nearly half of them, I know that some of these loads have standard primers, yet they ALL seem to be a lot hotter than they should be, and it makes me suspect the powder is more the problem than the primers.

Anyone else gotten higher velocities and more pronounced recoil with recent lots of Accurate Arms #5?
 
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Why would you load up a couple thousand rounds without even testing the load first?

My thoughts exactly. I would also add after firing that first round and noticing it was "hot" it would have been a good idea to stop and examine the fired round for signs of "pressure issues". You don't want to damage (or further damage) your firearm by continuing to fire rounds you suspect may be a problem. :eek:
 
Based on Accurate's load manual I would expect a velocity around 800 fps from that load, not particularly hot. Perhaps what you perceived was a result of more time spent at the loading bench than actually shooting. With the past winter we have had here in Michigan I would blame you a bit for staying inside making ammunition.

Personally, I regard Accurate # 5 as a powder more suited to light bullet Magnum loads rather than a powder for 38 specials, for that I use V-V 3N37. However, 10.0 grains with a 125 grain XTP using a Magnum primer makes a nice shooting Magnum with a relatively low flash profile and none of the BAHOOOM of H110.

So, don't be concerned about using a Magnum primer for your loads. Accurate recommends the use of Magnum primers for the Magnum loads and I don't foresee any risk of using a Magnum primer with a lighter charge weight.
 
Tritto on making and testing small batches BEFORE mass production.

Without a chrono it's hard to say exactly what's happening.

I don't believe that use of magnum primers has any substantive effect, beyond a few fps, only discernible by a chrono.

Recommend you take a hard look at your powder measuring/weighing process. It's not unusual for scales to get set wrong or get out of whack. Same for powder measures. If there is really a big velocity increase, verified by a chrono, then I supect the problem is overcharge.
 
I have shot thousands of AA #5 loads, all of them six grains behind my own hard cast 158 SWCs, with standard primers. Never was there a hint of a problem, and the last thing I would call the load was "hot".

My #13 Speer manual lists 6.2 grains of AA #5 behind their own swaged 158s, at a velocity of 922 fps. That is pretty mild, in my estimation.

I sincerely believe you have something else going on. I would pull a few rounds and check powder weight, as has already been suggested. While it is true that a magnum primer will add SOME pressure to a load, it is not going to cause what you describe. And you might weigh a few bullets, just for kicks. As a caster, I can tell you that it is pretty easy to "hide" an additional 15-20 grains of bullet weight based on profile, and that might cause what you are experiencing.

I firmly in my heart of hearts do not believe the problem is with AA #5, although you can certainly call Western Powder and ask them if there is a recall on #5. It never hurts to ask...
 
To address the questions and comments in order:

Some fool shot up my chronograph rods, so it's on the way back to the mothership for an overhaul.

I batch load, I've used AA-5 for years, and I would have tested the load IF I COULD HAVE. We have this thing called winter, with snow and stuff, and I don't live where you can walk out the back door and pop off a few rounds without the local hood rats getting all uppity about it. I've used these same components for thousands upon thousands of rounds without any hint of weirdness until now.

I DID stop and examine the first round, it looked normal, and I continued. After all six gave me the same impression, I examined all of them together, and couldn't see anything obvious.

I zero my RCBS Chargemaster before every loading session, and verify what's coming out of the powder measure when I begin. Three charges are thrown and dumped, the next ten are weighed, and just like always, the setting is right where it's supposed to be.

I wonder if my caster started making harder bullets? Maybe I should call Suter's choice and ask.
 
Why would you load up a couple thousand rounds without even testing the load first?

Because he has a 686 as a back up, silly.

I got some wspm for my HS6 that I got a few months back. Several have stated that it does better with the little hotter primer. They can help some slower burning powders but 90% of my powders are flake and standard work for me.
I did not notice any big difference between cci and win primers, be they regular or magnum in a lot of my testing..... but I have not ever used the faster AA powder, either.

Well at least you have ammo for the L frame, now........:D

Carry on.

PS:
a wooded dowel may work for a new rod..............
if you can find the right size.
 
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Reread the OP. He has used that powder for years, and favorite load was heavier than the 5.2 he chose....

A new batch of powder requires confirmation; powder lots vary as much as 10%, experienced reloaders should be well aware.
Then to substitute magnum primers compounds the possibilities, especially at near max loads.

Poor reloading practice, period.
Just because someone has gotten away with it in the past doesn't mean the next guy will.

Start low and work up, especially if you are substituting components or using new lots of powder.

The consequences of reloading effect not only your safety but those around.

Be safe and good luck.
Ruggy
 
So much for asking a simple question.......

I've been loading for 30+ years, my current total is about 735,000 rounds, and I have never had an aberration like this one, aside from some scary-hot Blue Dot 357 loads back in the 80's. I thought I'd ask the opinions of the learned folks here, but it seems some would rather give a lecture than actually add to the discussion.

I won't make that mistake again, trust me. Sheesh.
 
From your description the only possible cause I can think of would be that you got a bottle of Accurate #2 mis-labeled as Accurate #5. My experience with the Accurate Handgun powders is that all share the same appearance however all I've ever used are # 5, #7, & #9.

If so your load would correspond to something between a +P and 357 Magnum. Good news is that a 5.2 grain charge falls below the minimum recommended charge for a 357 Magnum so your load will be safe in your 686. Bad news is that you'll have to get your chronograph working to determine if that is what has happened.

If you do have a bottle of #2 labeled as #5 that is something that would mandate a call to Western Powders. Because a mistake like this tends to happen with more than just one pound of powder and I am sure that with some calibers this could result in a blown up gun. Since I happen to have a bit of a stash of #5 I would also appreciate a heads up if you happen to find you have a bottle that was mis-labeled.
 
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Beginners and novices frequent these forums for guidance.

What message are we sending?

Our round count and years of experience should help others become better hand loaders.

All powder lots can vary as much as 10%
I believe that is relevant to the discussion.

Be safe and good luck
Ruggy
 
"All powder lots can vary as much as 10%
I believe that is relevant to the discussion."

Sounds like his ammo was way beyond 10% over.
Since it "rocks" his 686.
Looks like Post #13 is the most likely. Too much fast powder will liven things up a lot.
Ten percent of his 5.2 gr is 0.5 gr, so 10% over would be equal to 5.7 gr, well below the 6.0 gr max for the load.

Best,
Rick
 
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Accurate has a simple...

AA has a simple numbering system where #2 is the fastest for light loads proceeding with #s 5, 7 and 9 being more of a magnum powder. Sometimes I think that #5 and #7 change characteristics depending on the caliber being loaded. It may be a misconception but sometimes I wonder....
 
"All powder lots can vary as much as 10%
I believe that is relevant to the discussion."

Sounds like his ammo was way beyond 10% over.
Since it "rocks" his 686.
Looks like Post #13 is the most likely. Too much fast powder will liven things up a lot.
Ten percent of his 5.2 gr is 0.5 gr, so 10% over would be equal to 5.7 gr, well below the 6.0 gr max for the load.

Best,
Rick

Max for the test gun and conditions of the test used to develop the data.
Change to magnum primers, we don't know where he was setting the bullet, brass volume differences between head stamps, scales off. Lots of variables and they can and do conspire against use.

I would ask is there a lesson here?

Start low and work up- its just a good practice.

Assume and bad things can happen.

Be safe and good luck
Ruggy
 
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AA has a simple numbering system where #2 is the fastest for light loads proceeding with #s 5, 7 and 9 being more of a magnum powder. Sometimes I think that #5 and #7 change characteristics depending on the caliber being loaded. It may be a misconception but sometimes I wonder....

Do some internal ballistics simulations and you will quickly find you are correct. Things happen very quickly with small changes with many powders.

Pressure curves are not linear.

And caution Burn Rates are not a measure of the energy you will get from a given volume of powder only how fast it happens under a given set of conditions.
 
AA powders over the years have varied a fair amount in my experience. Mostly AA9 and AA7 in 357 Sig and 10mm but enough that I would not ever load up AA powders with out the chrono before I ran off a big batch.

I suspect you got a hot lot of AA5 and the combination was "in spec" (whatever that was) but on the high side. Put it together with the right combination of thick brass and a hotter primer and it has all the makings of a hot load.
 
10%

Beginners and novices frequent these forums for guidance.

What message are we sending?

Our round count and years of experience should help others become better hand loaders.

All powder lots can vary as much as 10%
I believe that is relevant to the discussion.

Be safe and good luck
Ruggy

I need to know where it states that canister grade powder varies as much as 10%.

That appears to be a statement of fact which I have never seen in a reloading manual.

There are other reasons for variation in how a powder performs.

This includes temperature, bullet weight shape and the various size and thickness of the cases used.

Speer #14 only states that some minor variations will occur. I would consider 10 percent from batch to batch more than minor.

If you will please reference the source for the 10% burn rate variation.

I tried AA #5 in the .38 special and was disappointed. I'll stick to Unique in that caliber.

After trying AA#5 in several loads and various handguns I finally found a load where it exceeded my expectations.

I had acquired several hundred .45 caliber Nosler 185 grain JHP bullets in a deal.

When the Nosler and AA #5 where matched together in a reload I was truly impressed.

So now I know where the pound of AA #5 will be most effectively used.

BLM
 
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