There are no official published directions to splice 5/16 beeline or HRC. Here are the directions that have been told to me by the manufacturers last I checked (which would have been about a year ago).
Cut rope to length, strip cover from core. Set cover aside.
Splice a locking brummel for each eye in the core. Bury approx a 6" tail with the last 2" tapered.
Measure length from the base of 1 eye to the base of the other. Cut cover to that length (masking tape where the cuts will be to prevent raveling).
Slip cover back over core, whip cover in place at the throat of each eye. If you want to know what it should look like, just look over there <---
Eyes should be dipped in something so they don't gets ravelled and frayed over time.
Now there are several ways to accomplish the same thing. What I do for me and my customers is NOT what I explain here. My personal directions are more complicated to explain, end with the same overall measurements, but yield, in my opinion, a more perfectly balanced cover/core.
Do those directions make sense?
love
nick