I have an old SDB and a later 550. I wore out the SDB and rebuilt it, and keep it set up just for 9x19 now. I know of no changes I'd make to the SDB, other than to warn purchasers that Dillon really doesn't intend for SDBs to be used by true volume reloaders, loading multiple calibers. Only change I'd suggest to the 550 would be to the priming system. I'm not sure just what all is needed, but all of the problems I've had with my 550 have been with the primer feed. Granted, no machine is perfect, but I think this could be improved. Otherwise, the 550 is a marvel of engineering.
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