Bote, I found that 0.07 is about as big as you can go before the peep plate becomes so thin it's almost impossible to see.  I used JB Weld to build up the plate and then enlarged the peep to 0.10 and it's great!  The JB weld gave it enough meat to be visible too.  I'll see if I can get a picture.

Remember, if you switch to the 1901 rear sight, you also have to change your handguard!  By the way, I have a friend who shoots in the 290s.  He's shooting an 1894 (1896 configuration) with an 1896 rear sight!  The guy shoots like a robot!