I have used 10/22 variations with barrels way shorter than 8.5",
with no "cyling/reliability" issues with select ammo
(no subsonic, no target or other ammo that would
suposedly produce lower pressures).
However, if the barrel gets shorter than about 6",
depending on the ammo,
a radiused bolt and a good (proven) extractor
are highly recommended
to ensure "cyling/reliability" as you put it.
Also, barrels with tight match chambers may go
against the idea of cycling in a reliable manner.
10/22 variations with barrels of 5" or shorter
may require messing with the tension of the recoil spring
and are quite sensitive concerning the ammo.
At about 2.2"-2.5" the 10/22 would require
all of the above, an even lower tension spring,
plus additional weight in the bolt
(a block of lead, wolfram or tungsten).
Finding the right balance between the spring tension
and the additional weight is a real PITA.
But, at 8.5" it should cycle ok without any mods
and with a lot of ammo brands IMO.
Accuracy, on the other hand, will require
trying many ammo brands.