After doing a batch of .303 British to .256 Mannlicher I got to thinking (yeah, I know scary) why couldn't I mount the dies in the proper sequence in the 550 and have a finished or almost finished case with every pull?
303 in station 1, 308 in station 2, 7mm in station 3, 256 in station 4.
Cummulative effort probably isn't any more than full length sizing 44 Mag.
Or do the first 3 operations on the Dillon, the last on the Rockchucker so you can have a little more feel and have the opportunity to partially resize, back the case out rotate the case, then finish the sizing.
I'd try it but I don't have the right shell plate and on forming, I've gotten in the habit of using a shell holder that has been gound down .010-.015 thinner. It seems to set the shoulder back a little better.
Less spring back, easier to chamber for the first firing. I don't know how hard the Dillon shell plates are and if I could get it ground down as flat and even as I get the single stage shell holders.
Or should I go back to not thinking?