Adcock ACS Longbow: 50#'s at 29", 2117's 145 grain tip
Thunderstick MOAB longbow: 58#'s at 29", 2020's 145 grain tip
Howard Hill Longbow, 74#'s at 29", 2216 with 200 grain tip
Great Plains Recurve, 55#'s at 29", 2117's with 200 grain tip
Brackenbury Recurve, 64#'s at 29", 2216's with 200 grain tip
Check Mate Recurve, 54#'s at 29", 2016's with 200 grain tip

Most of my arrows are 30-30 1/2 inches long, all aluminum.

As you can see just knowing what the bow draws, does not necessarily match the spine of the arrow. I have two recurves that draw almost the same, one uses a 2117, and one uses a 2016. I have one longbow that shoots 2117 and is only 50#'s and one that shoots 2020's and is 58#'s. Quite a difference.