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We traded a 7720 for a 1660 (brand new), and we weren't happy with the capacity, and ability to hold canola in the back. The dealer claimed at the time the 1660 was at least a match for the 7720, but we didn't think so. Ended up trading to a 1680 a year later.

Depending on your acres I would worry that it's not enough combine.

Straw quality is worse with any rotary than a conventional. Even without a chopper, the straw is broken up when it's dry. At the very least the stems are split open top to bottom and kinked in a couple of places. But it's possible to bale it. Last year straw in my area was just really dry and brittle, and only square bales (big and small) were possible behind our rotaries. My neighbor tells me loved the bales, though, since he can just cut the strings and they practically explode into fine bedding.
 

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I'm just going on memory here, and we only ran a 1660 for one year, but at the time, the loss issue in canola we felt was from the sieves being so small. Just needed more area. Canola is really hard to keep in any combine, though. Doorknob runs a 1660 now, and works with grains even lighter than canola, so it can certainly work.
 
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