revhard Posted September 14, 2006 Report Share Posted September 14, 2006 i try to consider myself a very good bow hunter in all aspects. but one question seems to be haunting me by not knowing. i shoot a mathews switchback,wb, and easton epic arrows with a 28'' draw and 100 gr. tips. i chrono'ed my bow and it shot 247, 246, 247 fps. i know there is a difference between ibo(advertised) and amo, but what exactly is it and how do they each come up wih there figures? i feel like a retard not knowing this... dont rub it in! Quote Link to comment Share on other sites More sharing options...
Tony Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings A.M.O. Under this standard the bow being tested will have a maximum pull weight of 60lbs. The arrow will have a grain weight of 540(9 grains of arrow weight per pound of bow weight). The draw length will be set at 30 inches. The chronograph used for measuring the speed will be placed at point blank range for testing. I.B.O. Under this standard the bow being tested will have a maximum pull weight of 70lbs. The arrow will have a grain weight of 350(5 grains of arrow weight per pound of bow weight). The draw length will be set at 30 inches. a chronograph used for measuring the speed will be placed at point blank range for testing. there you go. Shoot Strong Tony Quote Link to comment Share on other sites More sharing options...
revhard Posted September 15, 2006 Author Report Share Posted September 15, 2006 Re: bow speed ratings so under those standngs, it seems as if my bow shoots fairly fast. i had a frind tell me that my bow shoots slow after i told him what it chrono'ed, and he rides me over it, but he wont get his done. and by the eye my bow seems to shoot as fast as hois does. i appreciate it tony, thanks Quote Link to comment Share on other sites More sharing options...
Smitteken Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings Everyone thinks you have to be approaching 300 fps to be fast. But those guys think 250 fps is 300 fps. B/c 250 is what they're shooting, and because the package says 300 IBO, thats what they're telling people. But when they put it on the chrono they think something is wrong. IBO ratings are fine for comparing bows side to side in a magazine, but knock 30-50 fps off of that and thats what you'll probably see in a hunting set up. I was shooting my new Pearson Stealth last week along side a guy that was blown out of the water by the speed. He thought I was shooting in excess of 320 fps. I said "no its about 260 fps." He was like "no way mine is shooting 300 and yours is way faster than mine." I told him "don't put it on the chrono because you'll probably cry." I won't mention what brand he was shooting. Quote Link to comment Share on other sites More sharing options...
revhard Posted September 15, 2006 Author Report Share Posted September 15, 2006 Re: bow speed ratings ha ha .. thats kinda what i was expecting to tell you the truth. i know it wouldnt be 318-320 like they advertise, but i thought it would be faster than it is by numbers anyway. but im perfectly happy with mine. shoot fast enough, as accurate as can be, and kills a crap load of wildlife! Quote Link to comment Share on other sites More sharing options...
hutchies Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings Another factor to that is when they IBO or AMO test they don't have any silencers, peep, nock, or loop on the string. All those things slow you down. Quote Link to comment Share on other sites More sharing options...
CamoGuy Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings Personally I think the whole bow speed thing is overrated. Let's look at some numbers. A bow that shoots 300fps will launch an arrow at 204 MPH. That means that the arrow will travel 30 yards in .30 or 3/10ths of a second. A bow that shoots 250fps will launch an arrow at 171 MPH. Sounds like a big difference huh? What it means is that means the arrow will travel 30 yards in .36 or 36/1000ths of a second. So in essence the arrow shot from the "slow" bow will arrive at it's destination 6/1000ths of a second later. Not much of a difference if you ask me. Quote Link to comment Share on other sites More sharing options...
Swamphunter Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings My XT is pretty much the same set-up as yours and at 66lbs, I am getting 262. A lot faster than my old bow that was shooting 250 at 70lbs. Quote Link to comment Share on other sites More sharing options...
hutchies Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings [ QUOTE ] Personally I think the whole bow speed thing is overrated. Let's look at some numbers. A bow that shoots 300fps will launch an arrow at 204 MPH. That means that the arrow will travel 30 yards in .30 or 3/10ths of a second. A bow that shoots 250fps will launch an arrow at 171 MPH. Sounds like a big difference huh? What it means is that means the arrow will travel 30 yards in .36 or 36/1000ths of a second. So in essence the arrow shot from the "slow" bow will arrive at it's destination 6/1000ths of a second later. Not much of a difference if you ask me. [/ QUOTE ] That is not the reason for speed. The faster it is the less drop you have in flight. So if you misjudge by a yard or 2 you are still making a kill shot. Quote Link to comment Share on other sites More sharing options...
ThethirdI Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings My arrows are flying at 206 feet per second through the chrono at 20 feet in front of my bow. My bow is almost dead silent and the deer don't know that the arrow is in flight until something hits them from "Out of the Blue". Last years buck didn't move until the arrow hit him. I would rather shoot slow and silent any day. Speed means nothing to me. Silence is deadly. Quote Link to comment Share on other sites More sharing options...
hutchies Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings Got shoot a parallel limb bow and tell me how loud it is. I guaruntee you will be surprised. Quote Link to comment Share on other sites More sharing options...
Guest luckyman4 Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings Thanks for posting this question, I always wondered myself. Tony, thanks for answering it. Quote Link to comment Share on other sites More sharing options...
revhard Posted September 15, 2006 Author Report Share Posted September 15, 2006 Re: bow speed ratings yeah speed is not a factor as far a bragging rights, but as said before,(hutchies). its not for speed but arow drop. im not sure about everyone elses bows, but i shoot the same pin to 25 yards and if i hold high, 30 yards. thats the ason i wanted a faster bow. Quote Link to comment Share on other sites More sharing options...
hutchies Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings I am shooting a 5 pin with a 2 inch ring. With a 200 FPS bow you would be able to shoot with the same site @ 50 to 60 yards. Quote Link to comment Share on other sites More sharing options...
revhard Posted September 15, 2006 Author Report Share Posted September 15, 2006 Re: bow speed ratings i have hree pins, 1st is to 25,30 2nd is 40 and the 3rd is 50. but i try not to shoot past 40. Quote Link to comment Share on other sites More sharing options...
OUTSIDER Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings My switchback shoots 272 fps. I use two pins , 20 and 30, my twenty shoots the same from 5 yds up to 20, my 30 is good to 40, i dont shoot more than 35 so i got all i need. Quote Link to comment Share on other sites More sharing options...
ThethirdI Posted September 15, 2006 Report Share Posted September 15, 2006 Re: bow speed ratings I don't have any pins and my bow shoots the same no matter what yardage I'm shooting. Quote Link to comment Share on other sites More sharing options...
PAbowhunter4life Posted September 16, 2006 Report Share Posted September 16, 2006 Re: bow speed ratings 30" 70# '05 Mathews Switchback shooting an arrow @ 280+ fps with a 418 grain arrow. One pin set up sighted in at 25 yards......... hold dead on from 0-30 yards and my arrow is in the vitals, either a tad high or a tad low. 40 yards I aim about 5" high and drop it right in the vitals. Haven't even bothered sighting in any of the other 3 pins yet. Speed is definitely a good thing in the event you misjudge the distance to your target, but it would take a screw up of more than 1 yard for it to matter. I pulled the following out of a bow speed discussion over on AT. As you can see, the bow is shooting 80 fps faster, but look at the TINY difference in point of impact between the 2 arrows......... Deer is 35 yds away, you estimate it at 30 Shooting at 270 fps you would hit 3.62" low Shooting at 350 fps you would hit 1.84" low for a difference of 1.78" Quote Link to comment Share on other sites More sharing options...
Guest MagnusBro Posted September 16, 2006 Report Share Posted September 16, 2006 Re: bow speed ratings hmmmmm...I wonder what the ibo, and amo ratings for the native americans' bows were. Quote Link to comment Share on other sites More sharing options...
PAbowhunter4life Posted September 16, 2006 Report Share Posted September 16, 2006 Re: bow speed ratings [ QUOTE ] hmmmmm...I wonder what the ibo, and amo ratings for the native americans' bows were. [/ QUOTE ] Hmmmmmm, I would say at least 300 fps lol Quote Link to comment Share on other sites More sharing options...
Tony Posted September 16, 2006 Report Share Posted September 16, 2006 Re: bow speed ratings Bottom line is your never going to get max speed out of your bow, if you not shooting a 30 inch draw. so if a bow is rated for say 300 fps and you only have a 27 inch draw, your never ever going to get close to 300 fps. whats really critical is that the bow fit you, its quiet and you shoot it well. anything else is icing on the cake. Shoot Strong Tony Quote Link to comment Share on other sites More sharing options...
Guest Kentucky_Head_Hunters Posted September 16, 2006 Report Share Posted September 16, 2006 Re: bow speed ratings I Shoot a Mathews Ultra 2 and I have shot through two different chronos at two different places. Both times I shot an average of 312 fps with 5 shots at each chrono. I have a 29" draw and I am shooting beman ics 400 arrows with 100 grain tips at 65lb pull. I do not know what the arrow weight is right off hand, but my bow is quiet and smokin when I shoot. Quote Link to comment Share on other sites More sharing options...
Tony Posted September 17, 2006 Report Share Posted September 17, 2006 Re: bow speed ratings better get them chronos checked.. they seem to be off a bit... Shoot Strong Tony Quote Link to comment Share on other sites More sharing options...
VtBowhunter Posted September 17, 2006 Report Share Posted September 17, 2006 Re: bow speed ratings I've always found that if you took the IBO and AMO speeds, added them together, and divided that number by 2 you'd be very close to an actual speed for your bows hunting set-up. Quote Link to comment Share on other sites More sharing options...
Born2Hunt Posted September 17, 2006 Report Share Posted September 17, 2006 Re: bow speed ratings [ QUOTE ] I Shoot a Mathews Ultra 2 and I have shot through two different chronos at two different places. Both times I shot an average of 312 fps with 5 shots at each chrono. I have a 29" draw and I am shooting beman ics 400 arrows with 100 grain tips at 65lb pull. I do not know what the arrow weight is right off hand, but my bow is quiet and smokin when I shoot. [/ QUOTE ]Those are happy chronos my friend! Quote Link to comment Share on other sites More sharing options...
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