I have a Double Bull that is tough to shoot from with my 64" Pronghorn. However, the last two seasons I've taken an antelope from it by unzipping the window on the roof (which I think is meant for shooting a shotgun out of), and planning my shot so my upper limb might poke out of that opening a hair.
That does lighten up the inside of the blind substantially which may cause some concealment concerns, but if you move slowly with stealth, I haven't had it cause me problems with antelope. Deer might be another story, but most deer scenarios lend themselves better to natural cover ground blinds anyway. At least in my area.