Accurate # 7

[itotorica]

Does any one here have tried Accurate #7? I'm using MG 147 on a G-17 and trying to be as close to 135 PF as possible/Thanks

[Guest]

AA# 7 works great in the .38 supers making major and can be used for minor loads in .38 super and 9mm. I've never used in in 9mm but have used a bunch for .38 super major and use it for minor in a pinch, but there are better powders for that IMHO. Be aware that AA#7 has its proponents and critics. The critics don't like it because they consider it to be gritty and and believe it wears out barrels faster. Personally, I haven't seen it but then I pretty much only use it for major and have only gone through a couple dozen jugs of the stuff.

Anyway, look at AA's load data, it shows a load for a 147g TRN that runs from 5.7-6.6gn. Looks like if you can start at around 6.0 and work it up to the 135 pf range you would still be in the published specs for that powder.

[Racer377]

I've used quite a few pounds of AA7. Its very consistent in both 9mm minor loads and 357Sig at minor and major PF (though its not recognized as such) and I like the recoil impulse of it. It meters out perfectly, as well. However it is really, really, really chunky dirty, especially at minor PF levels. In the 357Sig 150-160PF range, it would actually cause the weapon to malfunction because of all the crud in the chamber after a few hundred rounds. In 9mm 130-140PF loads, the amount of crud buildup was worse.

The other thing to watch for is that load data is all over the place for AA7. AA data for a 9mm Speer 147 TMJ is 5.4-6.2 @1.13. Speer 13 for the same bullet and same COL shows 6.1-6.8. That's a pretty significant difference. The big data variance is also present for other weights, and other cartridges. Something to consider as you work up a load.

[George]

When I ran 147's in my Glock 17L I used 5.0gr to get 130PF. OAL used and your "actual" bullet diameter will cause powder charge needed to get to 135PF to vary quite a bit. Could be as little as 5.2 to 5.4gr to as much as 6.8gr, all depending.

AA7 in 9mm under a heavy bullet was a very good recipe IME. I used a magnum SP primer to get more consistent ignition and it did help to tighten SD over the chrono.