Dillon seater plug question/problem...

[spikers220]

I had an issue recently when converting from 40 s&w RCBS dies to Dillon dies on my 650. I want to see what your thoughts were, if others have had the same issue and how it was resolved.

Components: New Win Brass and Berry's 180 grain FMJ's

Problem: Bullet seating creates a small bulge on one side of the case. (the bulge is significant because many rounds did not chamber check)

Diagnosis: I tried many different things before actually diagnosing the problem as the seater plug. I checked the alignment of the main shaft, shell plate and among other things. I also tried to loosen the dies while the stroke was in maximum position and then retighten the die locking rings. None of which was the problem. Well I knew I had the so called "correct" seater plug in but upon inspection, with the seater plug outside of the die, I noticed the bullet does not fit well in the seater plug concavity. In fact the bullet slides around quite a lot, thus during bullet seating the case bulges out to one side of the case.

Solution: I decided to take the semi-wad cutter side of the seater plug and reshape its concavity with my Dremel tool to fit the Berry's bullet. No bulge whatsoever and the accuracy improved considerably.

Just curious if others have ran into this problem, how they solved it or if anyone, including Dillon, makes different shaped seater plugs?

[Alan550]

Whichever version of Dillon dies you have, there is another seater plug included. The newest ones have it on the opposite end of the one you're using. Just pull it out & flip it over. The older ones had a different insert for different bullet shapes included in the die set.

Alan~^~

[spikers220]

That's exactly what I did. However neither match up even remotely close to the bullet contour.