2 replies [Last post]
Location: Canada, KY.
Joined: 01/02/2006
Posts: 11
F.P.S. Numbers

Need some info. Why the difference in AMO f.p.s. numbers and IBO f.p.s. numbers? Chuck <><

redrider's picture
Location: NE Kansas
Joined: 03/20/2006
Posts: 2589
F.P.S. Numbers

That's a good question I don't know the answer to, but I did find this:


Location: Summit, IL
Joined: 10/22/2006
Posts: 705
F.P.S. Numbers

To put it simply is this... AMO is found by using a fully set up arrow like you would actually shoot, i.e. it has fletchings and tip and is properly spined. I.B.O. is found using an arrow that is 5 grains per inch, no tip and no fletchings at 30 inch draw and the bow maxed out poundage. In other words if you shot it like that more than a few times you would have a blown up bow. When I bow shop I generally subtract 10 to 15% from advertised bow speed and it will be fairly close to what I set up at. I generally shoot with a 9 grain per inch arrow and 100 grain BH's (for deer) 125 for elk and My draw length is 29.5. Hope this answers your question and good luck.

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