Ironworker: I believe that 12 gns of Unique under a 240-245 gn slug is about max for the 44 mag. In some of my older manuals I see charges of 13 gns under a 232 gn cast slug with a max to 11 gns for the 250 gn cast.
I think Irold has it right, sticky brass is seen as a pressure indicator and with older or oft reloaded brass, the charge may be a bit too hot and you would get sitcky extraction. I have never reloaded Starline brass but I know that Federal brass used to be known for being good for many reloads without stretching, at least my Federal brass was and I can tellya from personal experience with nickle plated 45 acp brass that oafter a couple of reloads I have to put a significant crimp on the case just to hold the bullet.
Considering that you are using olde brass in some of your reloads could be seen as the problem. Also, the chambers on that Anaconda may be tight, thus favoring new brass for ease of extraction. You may want take a peekinto the chambers to see if they appear smooth or a bit rough - if rough, they can be smoothed for easier extraction. HTH.