Hehehe, I wish I'd never seen that formula for weight. Now I know why I'm sick of the 4+foot Oak trees. Nice score there Ray, just keep at it a little at a time. You'll not regret it when it's keeping you warm in 0 degree weather. As far as a saw, I'd go 90cc for 24" and up Oak.
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, but in all seriousness, if you're gonna scrounge on a regular basis you may want to consider a bit more saw than $ 300.00 will buy new. You'll want to be in the 60cc range, & keep the 023 for limbing & light work. A nice used 036 or MS 360 would fit the bill very nicely & keep you in or near budget. You'll be surprised that the fatigue factor isn't as bad as you would think because you don't have to sling the bigger saw for nearly as long to cut up those trunks. Also a pro grade saw has much better anti vibe which also helps minimize fatigue. Just some thoughts. A C