550,650 and 1050 all use standard dies.
The SQD uses dillon prop dies and is pistol cal only.
I have 1x 550, 1x SL900, 2x 650 and 2x 1050
I would not recommend a 650 or 1050 as a 1st progressive machine.
If you plan to load more than 1 caliber in batches under 1000rds at a time the 550 is by far the way to go.
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