Skates: Read my posts more carefully. The op's original question was, given that he had 400s tuned to his bow at almost full length, he was wondering if he could tune lighter spined 500s to his bow and perhaps shorten his arrow length as well.
My response was, yes, he could and suggested that he give it a try. I added that I preferred my arrows no longer than they need be because "longer" arrows create more movement than shorter arrows, when they're in a bow quiver or when retrieving them from a back quiver. I guess folks are having trouble following my examples of how longer arrows create more movement.
For example, "If my back quiver is 24 inch deep, and I shorten my my arrows from 31 to 28 inches its going to created MORE movement for me to retrieve them." Nope. That's not what i said. Just the opposite, in fact. I said longer arrows, not shorter arrows, create more movement.
This is what I said.
First post. "Given your draw length, the 400s, though they tune at a long length, are longer than you need. I've always found arrows longer than I need cumbersome. They create extra movement when removed from any quiver."
Second post. "The OP said the length difference might be as much as 4 inches (between what he is shooting now and the shorter length he could possibly attain with 500 spine arrows). When removing arrows from a back quiver, that's 4 more (more, not less) inches the archer's hand and the feathered end of the arrow must move before clearing the quiver. " Parenthetical statements added for clarity.
And arrow length really has nothing to do with killing animals. Shoot the length arrows you want (at targets or animals). I was just offering my reasons for preferring my arrows to be no longer than necessary.