You have to change your approach - start off with paper that is suitable, then size the bullets to comne up to the right dimension when patched - otherwise it might be hard to find the right paper thickness...
Also, try and go for a bullet sized to land diameter (.303 or +0.001), and partch up to groove diameter - or in you case, maybe better throat diameter - whatever fits well in yuor necksized cases. But I usually start with paper selection, then adapt the bullet sizing to suit.