[moooose102]

has anybody else noticed aa#7 being very dirty (lots of residue in the barrel) when using it for low presure or beginning loads?

[rcmodel]

NO, but it would be dirty at low pressure.
Thats why they make fast powder.

Any medium to slow powder will not burn clean at low pressure.
AA #7 is similiar to Blue Dot in burn rate, and is normally used in higher pressure rounds like full power 9mm and .357 / .44 Magnum mid-level loads.

If you want light loads, use faster powder.

rc

[Ben Shepherd]

Rc's got it.

If you're just wanting a load that follows the bottom of the AA7 load data, try switching over to AA5 and work up to the velocity you want(within listed data of course). Maybe even AA2.

A couple things to check if the above is not the case-

1. How's your neck tension? Slugs and the inside of the brass at the correct diameters?

2. Crimp. AA7 is a relatively slow pistol powder, and preforms best with a good crimp.