IBO
 

How much less than the advertised IBO does a bow normally shoot? I know there are a lot of variables to be included in this, but is there an average?

RE: IBO
 

The Bowtechs seem pretty close. Each one comes with a "birth certificate" where it was chrono'ed with a 5 gpi arrow. The biggest deflater of IBO seems to be that fact that most folks don't draw 30"; and we tend to put stuff on our bowstrings to quiet them down that hurts speed. Not to mention the tendency to run arrows heavier than the minimum - to get better penetration.

The only bow I have owned that was weak on IBO was the Fred Bear Element I got for my son in 2006. Calculating backwards from the chronograph, I came up with an "real" IBO of about 290. Manufacterer specs were just over 300.

RE: IBO
 

for a bow fully setup for hunting and an "average" shooter you generally loose 30-40fps off of IBO. thats "average" arrow weight, draw weight, legnth and string setups...sometimes more sometimes less...you shoot heavy arrows on a short draw and like a longer arrow and light draw weight, your going to loose more than the guy that likes a light arrow, as short as he can get them and shooting a maxed out bow...

30-40fps is usually pretty ballpark for a hunting setup though...

RE: IBO
 

Mauser is pretty close form my experience 30-40 fps less would be close with a " Hunting " set up

RE: IBO
 

my bt general shot 275 with 29.5"draw at 71#'s. with a 500(total)grain axis fmj with blazers and a whisker biscuit. i thought it was pretty good honestly. that is a heavy ass arrow. and on its birth certificate it said 300 even so a 25fps loss with that heavy hunting setup isnt too bad to me.

RE: IBO
 

Yeah that is pretty downright smokin' if you ask me.... I have an Iron Mace (pretty much same cam system as your bowtech) that is doing 282 at 63#s with a 454gr ACC at exactly the same draw as you. I'm shooting 346grs right now at flat 60 and whipping right at 305fps hunt ready.

RE: IBO
 

On my Legacey the IBO is 308 fps. I shoot a 28.5" draw and the best I could get out of mine was 294fps, shooting at 70# with a 28" 350gr. arrow, so I lost 14fps with a 1.5" shorter draw.of course my hunting set up is different, I shoot a heavier arrow.

RE: IBO
 

I got 311 from a 370 gr arrow (292 with a 430 gr hunting arrow)out of my Ally after replacing my strings and cables with Vapor Trail and messing with the position of my STS (Birth Cert has 314 I think). Drop of the STS and I'm at 294 with the 370 gr arrow.Before string/cable swap and adjusting STS I was at 283 with the 430 gr arrow.

According to OT2 my adjusted IBO is 309 now. Before it was 304. The interesting thing I drew from this is from those numbers that my bow was not as efficient with the stock string/cables and the STS in the highest position as it is now.

RE: IBO
 

The Diamond Marquis is ibo at 30" 70# 316 - 324 mine came with the birth ceritificate 311 60# 29" draw. for dropping 1 inch and 10# That isn't bad!:)

RE: IBO
 

What effect does the STS have on the speed of the bow?