Handsaw, chainsaw, or a Prazi-beam cutter attachment for a
circular saw. Or you can use the method one of my neighbors
uses--find a neighbor to do it for you.
If you chose a handsaw try to find an antique Disston crosscut
saw with maybe 8 points and sharpen it yourself. Joint it first
and set it after if it needs it, often they do not. Most off-the
handsaws are not really sharp, set too coarse, and with teeth
that are two fine. A 4 point ripsaw will crosscut quickly too,
but leave a rougher kerf.
Using a sharp handsaw isn't "overcomplicating"--it used to be that
sharpening one's saw was just part of daily life--my father sharpened
his saws regularly and he wasn't even a carpenter by trade, he was a
sailor. The trouble is that modern Western-pattern saws are either very
expensive or not very good and finding an old Disston in decent shape
may be difficult. A 40 buck ryoba with a throw-away blade works
remarkably well and is readily accessible.
I'd use a 'camp' saw (small bow saw). Th blade is long enough (and
straight) to get a good line up on the cutting line.
The OP could take some off each end and use the best end up.
Bill (who has other ways to cut a 4by that apparently the OP does not.)
I am disillusioned enough to know that no man's opinion on any subject
is worth (much) unless backed up with enough genuine information to make
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