mountaineer: Sir; I'm partial to the MK11's; your issues shouldn't be happening.
Should you get the MK11 again

try something

clean the barrel very very well. Lead will deposit with some of the different bullets. I returned one of mine; with disgust to Ruger.
My bullets were going through the target side ways. I still have the nice note from Ruger service department. It is and has been my favorite for years.
Consider this before shipping to Ruger. Another option in accuracy; try ''GunTalkOnline" They are "hot'' for the Ruger MK's; and the fellow who owns the site knows his stuff. Like here; they share; and are willing to help.