Afternoon Curt -
You'll need to slug your barrel and cylinder throats to determine the optimum bullet diameter for you pistol. Marshall has written an outstanding Technical Guide that covers this procedure in detail:
https://host9.christianwebhost.com/beartoothbullets/bulletselect/index1.htm
As for loading data, check out the loadswap.com interactive database. There are currently 3 loads listed for the 280 grainer. You can access loadswap from the icon menu (on the "left" of your screen).
(Edited by Alan at 3<!--emo&:0--><img src="http://beartoothbullets.com/iB_html/non-cgi/emoticons/wow.gif" border="0" valign="absmiddle" alt=':0'><!--endemo-->7 pm on Mar. 13, 2001)