I have the 6-24x50T... it has 30mm tubes...
I shoot it on a .223Rem Savage...
Optics are great... the box test is perfect as far as coming back to zero... but it adjusts about 10% further than you want... ie if you dial 10MOA you get about 11... but if you know this (and I hear this is common with many Bushnell products)... it's easy to overcome...
I shot it out to 900 yds... and it runs out of elevation (total 50MOA), but the mildot reticle allows for good hold over opportunities... but I have a tapered base coming for next time...
Overall... I like it...
EB