Best/worst powder for Whisper in an AR?

[cas]

Hello... off and on lurker for a while, making my first post. Sorry if this is a FAQ type question.

I've had a handful of 300 Whisper contender barrels over the years in a bunch of lengths, but I've finally got around to buying an AR upper. Most of my work has been with slower ball powders, W296/H110 , N110 and Lil'Gun. I know the Stoner platform has historically had problems with some powders, so I was wondering if there was a powder (or type) that is best avoided with the Whisper in an AR?

I get the feeling I'm going to be starting from scratch both in the rifles functioning, and the fact that my T/C loads C.O.L. is too great for the AR mag.

[Artful]

Accurate powder 5744 & 1680 is what I bought - search for loading data

http://www.quarterbore.com/300whisper/

http://feistyrooster.com/300x221/300x221index.html

http://www.larrywillis.com/300Whisper.html

http://www.accuratereloading.com/300whisper.html

http://www.saubier.com/smallcaliber/whisper.html

and of course

http://www.quarterbore.net/forums/showthread.php?t=189