Weld fool you are absolutely correct about ultrasonic vs the 17. I did exactly what you did. I used to go 4 hours in dry media. Get everything trimmed then into the sonic. Go one case at a time and wipe out the pockets with a q tip to get them as clean as I wanted them. Then back into the media for 4 more hours. Then inspect the cases one at a time to get the media out of the flash hole which was 90% of the cases. Now 2 hours in the 17 and bamm. Awesomeness. But I have the above differences to think about. I really think that the slight difference is no difference at all. Maybe even better as they seem to be more uniform result. I just wish I knew why my 260 was so out of line.