I've got an old Greencat with the cranked eyepiece (the right one to choose, after having had one with the straight eyepiece). Bought it second-hand off someone who was giving up shooting (he died a few months later) 22x. - there is an eyepiece with a bigger magnification, but I never/seldom use it, as the light level is just duller (might be useful for 1000yds, but I can't recall using it for that - most of the time I forget there is a second eyepiece). Always put the endcaps back on afterwards. A good stand that works for you is just as important, not something that falls over every time you turn round. The one I've got has had almost every bit replaced over the years.
Can see the holes at 100yds, more than that is doubtful.