I posted the same question here about a month ago with no replies. Google is your friend and as suggested, look for pin shooting loads. It seems that the Lee 250 grain cast is a favourite as it feeds well while others report good success with swc shapes. Powder charges are all over the map! Be careful. I'm considering trying 5.0 grains Unique and working from there. One of the older Speer manuals reported loads for their 260 bullet so data is out there. Others are posting .45 super data that is high pressure. Good luck.