I bought a pound but the new data is 1 grain light. Did they reformulate it or is it the lawyers again?
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October 4, 2012, 01:15 PM
I am confused by the question. Are you talking a particular data recipe from a source? I know that the 8th edition Hornady book reduced some 10mm loads so they may have backed off on 9 as well. I personally use a faster powder for 9mm though. Bullseye is my favorite but use AA2 as well.
October 4, 2012, 02:03 PM
► I believe all the Accurate powder data was recalculated about 10 years ago. Not sure if that was lawyers or data conversion caused by new lab equipment, but the loads dropped.
► Like the AA No.2 & No.5, it's so fine it can leak out of loose powder measures. Dillon offers a special tight fitting powder bar; Lee can leave you with a mess.
► I prefer No.7 in 38 Super, but it can work in 9x19. The issue is the volumes of powder used. You may have trouble with the small 9x19 case. Once in there it shoots great; high accuracy and low std deviations.
October 4, 2012, 07:33 PM
Used it for years in my 9's. The powder has been sourced from a few places over the years...I have had batches from Israel and Czech. The current stuff is from the US. My last keg was Cz. my new one is US.
The US stuff looks different than the old stuff although they say it has been said the formula is the same. That said I am dropping my loads a bit and reworking. #7 has always liked to be run hard; the nice thing is that in the 9 it fills the case well. I don't know if it is still true but the older Corbon 9mm +P loads used this powder.
One of the things I like about this powder is that in my comp.ed P89 I have virtually zero muzzle flip. At full power loads my muzzle actually goes down a touch.
Edit: I also found it very useful in 125 and 158 gr. loads for my SP101. It gives me better overall results than W296 and AA#9 with both bullet weights.
October 5, 2012, 12:01 AM
Thank You all for your input. I was looking at my Loadbooks USA compilation, but I guess it is just too old. I did notice the new #7 is made here. Oh well, I guess I'll just have to use less.
October 7, 2012, 09:46 PM
It is a favorite powder for 9mm, using 124 gn xtp's and fed sp mag primers. About 1180 fps from 4.5 inch barrel, and very good accuracy.
October 7, 2012, 10:05 PM
AA#7 is excellent for producing high velocity and load density with 124 gr and 147 gr. bullets. I haven't tried the reformulated #7, but has been mentioned it is also excellent for .357 Magnum loads for snubs. Much less muzzleblast without all of the velocity loss of the magnum powders like H110/W296. ;)
October 7, 2012, 10:16 PM
CZ57-am also using it for 357 "mid level" 125 jhp loads, also with the fed mag primers. Extremely accurate in the pistols tried in.
October 7, 2012, 10:43 PM
Sierra emailed me their latest data sheet and their loads are way hotter than what AA lists. This is recent data using the US sourced powder. What gives?
October 7, 2012, 11:24 PM
I've used AA#7 over the years, it once worked well for me in 44spl with 200gr JHPs but the newer batch left partially burnt powder that tied up the revolver.
With the new batch of #7 I loaded it with 240gr jacketed and it worked well, the remainder I loaded in 357 Mag for a 2.75" Ruger Sec Six and it did very well at the lower end with jacked bullets, low flash and accurate.
October 8, 2012, 12:17 AM
I use a ton of AA7 for 10mm.
October 8, 2012, 08:57 AM
My recollection is that it was originally designed for 7.62x25. I have not used it in that, but I have used a lot of it in the .40 S&W, and plan to use it in heavy bullet 9mm.
I like it because it fills up the case, such that a double charge will not fit in the case. Accuracy with cast Lead bullets is decent.
It does leave a sprinkling of unburned powder all over the bench, but the bore is clear.
October 8, 2012, 09:05 AM
AA#7 has worked well for me loading 9x19 and midrange loads for 357 mag. I bought several 8# jugs of "commercial" #7 years ago(unfortunately almost gone now). It was a different density than canister powder and required a slight measure tweeking to achieve the same velocities as canister. I get some impressive velocities using Gold Dot 124 HP in the 9mm w/o any indications of over pressure.
I've got my Dillon set and working now and intend to lay in a stock of #7 to load with this winter.
October 9, 2012, 09:12 AM
I'd just like to take a second and offer a correction for the OP's grammar. That shouldn't be "they" 9; should be "dey" 9. :evil:
October 9, 2012, 11:08 AM
So nobody knows why the new data is so pathetic? I thought Sierra's data is conservative. I have a feeling they didn't retest it using new equipment. I think what happened was their supplier made a lot of powder for a real big customer who wanted the powder to do A, B, and C. Western Powder, to save money, decided to piggyback off that order and sell this powder as AA#7. I don't like this at all. People spend slot of time and money working up their loads only to have the manufacturer change the specs. This isn't right.
October 9, 2012, 12:57 PM
I have had the same basic problem with AA #5. Pretty big differences between some lots. I still haven't found a better full load/+P .38 Spl powder yet, but I'm looking. I may have to go off the charts to get it.
I have some older AA #9, so I use the older data with it. I may not buy any more just because it is frustrating to redo data for a new lot. There are too many choices of powders that do a much better job of lot to lot performance year after year. AA powders have been made all over the place. I have used a lot of there powder though.
October 9, 2012, 05:01 PM
Walkalong, here's some pretty decent load data for Silhouette in .38 Special and it's fairly mild standard pressure. They only show +P data with the 110 Barnes XPB. ;)