Billy Goat
WKR
What kind of speed is usually gained with the 80?
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Zero.
That's what I have seen anyways. The difference is the 80's actually have a slightly shorter draw, they keep it from dumping all the way into the valley.
So the little bit of speed that might be gained by the lower letoff is offset by the difference in draw length I assume.
I haven't ever twisted things up to get them at the exact same draw length, so you might see a little difference there, but to take the same bow and just swap mods between 80 and 85 you won't see a difference in speed. I bet most don't notice the difference in DL either, it's not much.