Hi, i need help,

, i have the capacity to install a 106' screen in my room & the hd20 i am planning to buy will just about fill the screen from the distance calculators i have used, however i cannot find a panoview 106' motorised screen anywhere but can get a 120' screen, which with a bit of shuffling around i maybe able to mount, what i wanted to know is if i go for the 120' screen , where i plan to mount the HD20 i can only project 106' , will the picture bleed onto the rest of the 120' screen, what would the effect of projecting a 106' projection onto a 120' screen be.
Thanks for taknig the time to help....