@Dragonman.
Most, but not all, I try to keep my horn nocks fairly small, a longbow can be pretty cumbersome at the best of times without adding any extra length.
This pick shows my last one, you can see the
mistake feature
where the wood peeks through, showing that it actually goes deep into the horn. Anyhow, that's how I do 'em.
Del
PS:- Note sthe shape lends itself to using a stringer, which also pulls onto the wood filled section.