I'm going through a bit of a compulsive stage again (not sure I was ever out of it). Anyhow, I did a search for something else and found this thread: http://www.longrangehunting.com/forums/f19/how-do-you-get-low-es-velocity-number-25259/ After reading this I'm wondering if anyone had any "eureka" moments on the topic of cleaning inside case necks recently (or in the past) that they are willing to share? It all got me thinking again and I have posted on this before. I'm still of the opinion that consistent tension is largely determined by the uniformity of the internal finish of the case neck. It seems logical too. I started seeing great ES numbers with a caliber that I load with an expander - which seems to consitently polish (burnish?) the internal surface of my ultrasonically cleaned necks. They look incredibly smooth and shiny compared with any other case necks that I've cleaned in various ways. It made me wonder about the polishing idea that many seem to warn against. I also tried dipping some necks in a Redding Dry lubricator (the little ceramic ball deal) which in VERY LIMITED testing worked quite well despite my concerns (and those of others I've read) that applying dry lube consistently is actually impossible as it doesn't adhere evenly to the surface of the brass. This worries me that bullet release may not be perfectly straight if pull varies around the circumference. I read Steve Shelp's comments in the thread I linked (pretty much what I've done in the past). And Shawn Carlock's (which I tried recently). Shawn, how do you clean the neck inside before dry lubing? I agree to some extent with with both those views! I do know that tension is not the same with ultrasonically cleaned necks and carboned necks, but getting it consistent for full diameter is becoming a pain with my brass brush approach (particularly in an ultrasonically "almost bare metal" neck as there are always little patches of carbon). I'm almost thinking not going the ultrasonic route makes consistent results easier with less effort. That, or I need to try with the case necks standing out of the liquid. Has anyone done some testing on ES / SD's with various approaches? Thanks for sharing any recent findings.