Crank up the 650 or 1050, you'll be done in less time than it takes to make the drive up and back. Regarding media in flash holes, it's a non issue. Like the debate about tumbling loaded rounds , to remove the lube.
Guy over on arfcom, or Benos? did a test of tumbled totally clean, tumbled with media etc. He found no difference FPS, or performance wise between media free and small bits of media remaining. he also test loaded some 223 with media blatantly left in the flash hole, again no issue.
The Great Kazoo's Feedback
"when you're happy you enjoy the melody but, when you're broken you understand the lyrics".