Center of Gravity on ohio rc extra 300L
Harold, I also have the plans for the 72" version. They call 4 in back from the leading edge "sport" and 4 1/2 back "expert".
I was worried about my flying skills when I first flew this plane, so I added 8 oz of nose weight to get the CG in the middle of the range. After 2 flights, I removed the weight altogether, which moved it to about 4 3/4 back, and I think it still needs to move farther back. Set it where it feels right, like 3dbatixkid said, but I wouldn't worry too much about keeping it forward.
doug