41 mag
 

I loaded up some 210gr. Hornady XTPs with 17.8gr of Accurate No 9. They are justtopping 1500fps out of my Ruger Blackhawk. The primers look good and there are no other signs of high pressur but, The cases are covered in soot. Could it be pausable that even though these are almost max loads, that the cases aren't expanding to seal the chamber?