When I was having the same issue with my 1050, I asked Rick Koskela and he said...
"...simply use the tapered Dillon powder funnel if you use and properly adjust the Dillon swage back up rod when reloading. (even if not swaging the brass primer pockets). The swage back up rod has an expander step that is similar to the one on the MrBulletfeeder powder funnel.
Alternatively… if not swaging, you try installing a Lyman M-Die in the swage position. The M-Die is a case mouth expanding die that is adjustable for depth of expansion."
I went back to the Dillon funnel and haved never looked back.
This is a really old topic, but I thought I'd add my 2 cents on this. In my 9mm setup, the Dillon Swage Back-up Rod bottomed out in the case before expanding the case mouth enough to properly seat bullets. I took a flat file and carefully took a few thousandths off the end of the back-up rod being sure to turn it 90 degrees in between strokes to keep it flat. Now it bells the case nicely and problem solved.
Mr. Bullet Feeder powder funnel sticky
in non-Dillon Reloading Equipment
Posted
This is a really old topic, but I thought I'd add my 2 cents on this. In my 9mm setup, the Dillon Swage Back-up Rod bottomed out in the case before expanding the case mouth enough to properly seat bullets. I took a flat file and carefully took a few thousandths off the end of the back-up rod being sure to turn it 90 degrees in between strokes to keep it flat. Now it bells the case nicely and problem solved.