I think I've found a use for that 30MOA base rail that my brother has...
They're not the first to go with such a huge lens, US Optics has their SN9 10-42x56mm standard scope comes with as an 80mm version as well and that is being mounted on Priscella, the purple poodle eater...
I've used a 40x scope on my 100 BR rifles and switched it down to a 36x then to a 32x and now it wears a 24x for hot days and the 32x for cool/cloudy days...but they're all 40mm or 45mm...
I'm wanting to build a 50 yd rimfire BR gun and having problems putting a scope on it, 15/16x is a little too light/weak and 20x is just a little too heavy/strong...What I really need is an old Unertl 18x 2" target scope but there goes any chance of making weight class...Better a little more then a little less, so it'll probably be the 20x...
I only use fixed powers on my short distance rifles...My 300 yd and 1K yd rifles wear variables to reduce mirage effect and one 200 has a fixed (6mm PPC) and the other a variable (.22 PPC) but that's to help see the bullet holes...

SN9 80mm scope