Jammer Six,
As you may already know, John Whidden is one of the premier long range highpower prone shooters in the country. The last I heard, he loads on a Dillon, though he uses a lab grade scale to weigh powder charges. You can read an article about it, including a photo of his setup, here:
http://www.accurateshooter.com/guns-of-week/gunweek059/
The pertinent part of the article for present purposes is as follows:
"For most of my reloading I de-cap, full-length size, prime, and seat bullets with a Dillon progressive press. However, I’ve removed the Dillon powder measure and replaced that with a funnel. I throw the charges with an RCBS UniFlow, then trickle to 0.1 grain, and weigh each charge with a Denver Instrument APX-200, a milligram lab scale. Once I’m satisfied with the charge, I pour it through the funnel into the re-sized case. Then the loading procedure returns to progressive mode."
John is a mechanically-oriented guy who also operates a gunsmithing and shooting products business. He makes and sells toolheads for the Dillon, though I have not used them. See
http://www.whiddengunworks.com/products/.
I've never met John but I know several people who have, and everyone says he's a very nice guy. His website has contact info and I bet he'd give you information about his setup if you contact him.
I regret that this thread got a little off track. I load for both short range benchrest and mid-range and long range highpower, and would be glad to answer whatever other questions you might have, to the best of my limited ability. Feel free to email me at drabin55 {at} cs.com.
Dave Rabin