I have a 550 and love it. I got a great deal on a used one and have been finding tool heads and components on ebay pretty cheap. Just be aware that tool heads are proprietary to the 450/550 and the 650/750. If I had the money I would have gone straight for the 650, but I load mainly for myself now that most of the kids are out of the house and the 550 keeps up nicely with my shooting volume.
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USS Brewton FF1086
SWCA#3597
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