I tried test loads using BD for Winchester and Nosler 158 JHP bullets for my .357 and the result was not as stellar as with the Speer 158 GD. I'm thinking of trying AA7 but the burn rate is similar to BD. Will I therefore get the same result. Has anyone tested a powder that performed poorly and then tested another powder with a similar burn rate and the test result was better? I've used AA9 years ago and that was good. I just didn't like the recoil. I would guess that 2400 should be close to AA9.