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I agree with Keith as well. If you shoot one caliber a lot get a 650 with casefeeder and add the K.I.S.S. bulletfeeder and you'll be in heaven. I have a 650 and a 1050 with a bulletfeeder and it rocks!!! If you shoot a lot of different calibers keep one press setup for large primers and one for small.
The 1050 is definately a better machine than anything else. However, it does have some limitations. If you switch calibers often then don't buy the 1050. It takes a while to change calibers and if I need to change I will simply buy another press or just keep using my 650 as I'm currently doing. The learning curve on the 1050 is much higher than the 650 and takes some tuning (at least on mine) to get it working 100%. That being said I will never be without a 1050 again. If you're shooting a ton and want to cut your reloading down then go with the 1050 but if you're only shooting 1000 rounds or so a month then the 650 is the way to go. Save your money on the 1050 and buy another gun. LOL
Pete
My bench evolved somewhat differently.
I had the opportunity to pick up another 550, as-new for very short money. As it came w/Dillon .45 ACP dies (and a lot of other stuff!), it became THE large primer machine (which is to say, the .45 machine) and the original 550 does all the small primer calibers.
Since I had 3 spare 550 toolheads, it seemed the cost-effective way to go.