Had a go. Could see mu Cru easily, but I think it might be a bit brighter than the mag 4.3 you've got marked (mag 4.0). In any case, could see delta Cru at mag 4.3, and nearby zeta & eta Cru easily (4.0 & 4.1). Funnily enough, surprised that I could see the Jewel Box - also lambda Cru 4.6, right on the very limit & only popping into view occasionally. Nothing deeper.
So, limiting magnitude 4.6.
Rural setting (I live in a 'suburban' street in a country town say 3000 pop, but am right on the outer edge)
Good luck with it!
Cheers -