Don't believe Harbor frieght when they tell you what gauge any of
their products can handle. I have one of their 30" straight shears
that is also supposed to handle 18ga mild steel ( I work on large
projects). This thing is literally a poor copy of a $1,500.00 Dixon
shear (I mean they USED a Dixon for the actual molds) The
instruction sheets were photo copies of the Dixon manual with the
name not quite whited out.
Anyway, on a good day, I maybe can get it to cut 20 ga copper for a
few inches, usuallly I can get it to handel 22 ga brass and silver
okay (except for long thin cuts) and this is a straight shear not
the rotory unit you mentioned. I would think that with the rotory
you should expect a realistic working limit of 24Ga.
I hope this helps,