Give me the difference?

IBO is anarrow that is 5 grains per pound draw weight at 30 inches.And AMO is an arrow that is 540 grains from a 60 lb. bow at 30 inches.

AMO is a specified industry standard test, listed with the American Society of Testing and Materials. (Specification #ASTM 1544-99)

IBO speedis total BS, and has absolutely nothing to do with IBO.A bunch of guysstarted shooting the lightest arrows they couldand still be legal under IBO minimum arrow weight rules (5 grains per pound)to see how fast they'd go out of their bows. The manufacturers' marketing dudes got hold of the idea and cooked up "IBO speed".It's totally unofficial, so it's very easy to cheat. Since speed sells bows nowadays, there's a lot of cheating going on.

In my opinion, hunters would be much better off if manufacturers removed all speed ratings from their bows. They are not only misleading, they tend to have hunters trying to acheive those speeds, which usually hurts accuracy with a broadhead.

Hunters would be helped more by a rating on the amount of energy needed to draw a bow at a particular draw weight/length.

well in my opinoin in my state 35 pound bow is legal hunting poundage if you can kill a deer with that you dont need 70# and 300 feet per second alot of people use to small of arrow to get that speed witch hurts the bow so i think they need to stop selling the bull

I wish they would go back to listing AMO speeds, but it just doesn't sound as good so it will never happen.

Paul