If you have those components, try it! Then report your findings...
Accurate #7 and .357 Magnum
- Thread starter burneyr
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smithra_66
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Standard primers would be ideal for this powder.
ArchAngelCD
Moderator, SWCA Member, Absent Comrade
I wrote Hodgdon and asked them why they list all powders in magnum loads needing to use a magnum primer. They wrote me back saying they do that because many reloaders don't check the primer used and assume they need a magnum primer. They are concerned the max charge will be over pressure if developed with a standard primer and then loaded with a magnum primer.
That was the first time I got an explanation that actually sounded reasonable.
That was the first time I got an explanation that actually sounded reasonable.
I, & others, had issues with AA#9, in several cartridges, that were documented in this thread from 2013.
Long read but the misfires/hang-fires/squibs were eliminated & confirmed by several parties once a hotter primer was used.
AA#9 Squibs in 45 Colt cases
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ArchAngelCD
Moderator, SWCA Member, Absent Comrade
Slower handgun ball powders usually work better with a magnum primer. The faster ones seem just fine with a standard primer. 2400 is the the most known exception.
gwpercle
Member
Isn't that the truth !!!
I was thinkig that if all the data was worked up with Magnum Primers then using a Regular Primer would be safe , you may be a few fps lower ...but that's not a problem .
Seems like the velocity difference between magnum primed and standard primed isn't that great .
Gary
ArchAngelCD
Moderator, SWCA Member, Absent Comrade
Both of my opinions are true. I did say most, not all. There are always exceptions and there is a difference between "must use" and "usually work better." Everyone needs to test the loads for themselves. The results from one reloaded aren't always the results of another. That's why I try not to make statements that anything is written in stone.
Like I said, slow ball powders usually work better with a magnum primer and most reloaders find they don't need to use a magnum primer with AA#9.
For years my accuracy loads for 357 mag use AA-7 with 125/145/158 jhp's. As previously stated, needing a mag primer is not the same as working better with a mag primer. Got noticeably better accuracy using Fed 200 primers than Fed 100 primers. Velocity just a little slower than using slower "magnum" powders, but less flash/bang.
Also use AA-7 for full power 9mm 124/147 jhp loads, and again the Fed mag primers gave better accuracy and slightly higher velocity than the standard fed sp p.
Have started trying AA-7 for 230 jhp 45 acp loads. AA-7 is a tad touchy for these, and the 45 acp loads tried preferred standard Fed lp primers for accuracy/consistency.
Use a lot of W748 for 223/308 loads, and mag primers consistently gave better accuracy, although some what temp sensitive.
Also use AA-7 for full power 9mm 124/147 jhp loads, and again the Fed mag primers gave better accuracy and slightly higher velocity than the standard fed sp p.
Have started trying AA-7 for 230 jhp 45 acp loads. AA-7 is a tad touchy for these, and the 45 acp loads tried preferred standard Fed lp primers for accuracy/consistency.
Use a lot of W748 for 223/308 loads, and mag primers consistently gave better accuracy, although some what temp sensitive.
.
As I stated in the 2013 thread, Accurate told me, when I asked about my problem, that they suggest that magnum primers be used with AA#9.
They don't help the situation when their test data for a given cartridge, that mixes loads using fast & slow powders, shows they used a "one-stop does all" primer like a WLP or Rem 2-1/2.
That usage doesn't tell you that any given powder needs a magnum primer.
And not all of their load data uses a magnum primer. In some cartridges they used a standard primer for all loads.
Other reloading guides specify when a powder needs a magnum primer with an asterisk.
And note I said powder, not load.
Accurate didn't say some loads, they said that powder.
It doesn't make safe reloading practice, or sense, to say you can use a regular primer with a given powder until you find a load that it actually needs a magnum primer to fire reliably with. That's nonsense.
If a powder needs a magnum primer for some, or any load, then use a magnum primer with it all the time & avoid mis-fires, erratic ignition & squibs by using a magnum always.
All my AA#9 loads will be over magnum primers.
.
BillBro
Member
10.7gr AA7, standard primer, favorite load. But, Ive lost my freaking load data book, and still havent found it so please take my gr with a gr of salt. I believe Im right tho. Another, I think, is 10.1gr, is my lighter loading.
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