I was purely a bullseye powder fan for 38 and 45acp for a long time. But with availability issues of bullseye and the recent huge increase in price on Alliant brand powders (over 60 dollars a pound) I've changed to titegroup and glad I did.DW357 posted about this position sensitivity a few years ago:
Powder position sensitivity?
So I've been doing a lot of testing with various powders to get my Coonan 357 mag 1911 to cycle with the 10lb spring (intended for 38 special +p). This has forced me to finally bust out the new chronograph I got back in November to see how these loads are running. I'm using Xtreme plated 158...www.northeastshooters.com
I use it for a lot too....it's a great powder.