First off let me apologize in advance if this topic has already been covered, the search engine didn't want to play tonight.
I bought a mildly used Super 1050 that came from the factory set-up for 38 Supercomp and has never been converted to any other caliber. From day 1 the casefeeder never fed quite right: approx 5-20 cases per hundred would be fed by the casefeed plunger too much to the right (cases were offset within the plunger to the right) and therefore would not feed correctly, if at all, into the shellplate. Numerous calls to Dillon ended up fruitless
On a whim I double checked the caliber conversion chart, and noticed that my press had a green casefeed adapter (38 Super style) but the cases had a lot of room within the adapter to move around (not good), so I called them to see if this was the right adapter for Supercomp, they said "No, you need the white 380 adapter due to the rim diameter of the Supercomp." So I go ahead and buy the white adapter, got it today, excitedly installed it, and voila the casefeeder won't feed at all now because the adapter is longer and the Supercomps are too tall to feed through it
Ultimately I think the white adapter's smaller internal diameter will center the case better and fix my casefeeding issues, but only if I modify the adapter by shortening it.
Is there a better solution? What works for you?