Ben, you are welcome for any help I may have given you.
As for powder I prefered N350, many of the 38 super, super comp and 9x23 shooters I built guns for was using SP2.
I've been out of the competition circle for awhile so I'm not sure what's being used now.
If you have a USPSA club close by ask some of the open division masters and grandmasters what powder they are using or recommend.
Best Regards
Bob Hunter
www.huntercustoms.com