Brass/Aluminum Guids

I have seen brass guides increase accuracy with a small loss of FPS using 9/16ths. Has anyone built a brass breach using 19/32 which is slightly larger??. 9/16 is .5626 vs 19/32 is .5938.
I'm planning on running the new Fang motors in a OFP 42mm cage with a guide, if that helps.

Thanks!