Originally Posted by
P Flados
I am not sure how to help you with the feeding issues, but I did run some stuff through Quickload.
You have the Lee tumble lube 200 gr. At 0.578" long, this bullet is shorter than most 200 SWCs. For a given AOL, a short bullet gives you more space in the case and less pressure. Note that the Alliant load data includes the Speer 200 LSWC. That bullet is 0.660" or 0082" longer that yours. To get the same seating depth as the Alliant 1.2" AOL with the Speer, you would be at 1.118" AOL with the Lee.
Just for margin I used an AOL a little shorter than your current load at 1.15". I then found it took 5.3 gr of Bullseye to stay just below the pressures I got when ran the Alliant 200 SWC load. Calculated speed from a 5" gun was 960 fps.
If this is just a target/plinking load, I would go for a charge that is just a little above the minimum needed to cycle the gun properly.