I have used a lot of #9 for 357 and others.
My one all-inclusive comment about it is to fill the case or use a different powder.
Accurate Arms does not "make" any gun powder, they custom blend powder that they buy from others.
I got on to Accurate #9 when I began loading for 454 back in '97 or '98 and used a lot of it in the following years.
Then I found out that #9 is a duplicate of military surplus WC820 and that Accurate Arms is the surplus suppliers biggest customer. Hmmm.
The suppliers will say to use H110 load data with WC820 but if you do you'll never see H110 results.
Compare #9 and WC820 side by side and it looks the same, weighs the same, meters the same and gives the same velocities over the chronograph...my conclusion, its the same, (this is from several side-by-side tests.)
So, I bought a couple gallon-jugs (8-lbs each) of WC820 and never looked back. I saved about 50% including HAZMAT fees. (WC820 is what the military uses for the 30-Carbine.)
Anyway, I have used it for 357 but filling the case, (which is correct use for this powder) makes for a pretty hot load in the 357.
The load books never show a full-case load with #9 for the 357.
I think its wise to only use Ruger revolvers if you're gonna be filling the 357 case.
On filling the case, this powder, (WC820 or #9) gives very wide velocity ranges when the case is not filled. (Same for H110 or 296...until the case is getting filled.)
Reason: Inconsistent results. They all give wide velocity ranges if not filled.
This is something only a chronograph can tell you.
If you're not going to fill the case I'd say use a different powder.
Will #9 or WC820 give the same velocities as H110 or 296? No.
Accurate #9 is a faster powder than they are so it just can't do what they do.
However you'll get plenty of velocity from it.
I fill the case whenever I use it and get excellent (consistent) performance in everything I've tried.
I never found a primer than didn't ignite it just fine.
I never saw a difference worth mentioning from different primers in side by side tests with any of these powders.
Sure, hotter primers give 10 to 20 more fps...that's what I call a meaningless difference.
I shoot over a chronograph during most of my shooting, not just a few shots now and then. It really opens your eyes about what is actually going on.
Everyone would be surprised about what isn't happening when they're shooting as compared to what they think is going on...if they'd just use a chronograph and keep records.
If you don't use a chronograph you can't possibly know what is going on and if you only use it now and then you only have a vague idea of what the loads are doing.
The load books and factory rep's do not tell you what is really going on at your shooting bench.
All that they can give you is "guidelines".
The various factory representatives all give the "company approved" information which is loaded with "fudge-factor" to insure against the possibility of a liability-lawsuit. You have to take whatever they tell you with a couple grains of salt. What they'll say is seldom a precise truth...but its always "safe".
BTW, hang-fires are almost never about the powder. Its usually about the primer or how it was seated. The primer manufacturers will tell you that if you ask. My own records & experiences tend to back that up.