After trying to find the efficiency and SE/PDF ratio for my and coming up empty handed I guess I'll just ask somewhere on here. Can anyone give me a ball park figure on what FPS I'm shooting.
02 Magnatec with ZR200 Limbs
Versa cam
29.5 in. draw
about 429 gr. arrow with BH
All I have on the strings are a couple leeches and a realease loop, no peep sight.
Thanks for the help!

On your other thread.....98Redline said the IBO for your bow was 283 fps !
So based on your spec's listed :

If your shooting 70 lbs ...you should be getting in the mid-high 240's ! If your shooting less than 70 or more add/reduce by 2 fps per pound ! That should get you close !

Titleist, if you know what the bow IBOs at, and what your draw weight is, I can get you pretty close.

On Edit: I agree with what CBM said. Based on an IBO speed of 283 and 70# draw weight with only leeches and a string loop, you should be around 246 fps.

Alright, thanks alot guys!

Based on an IBO of 283 I get 253@70 lbs. That's using the calculator @ Bowjackson and using 1.25 for the ratio and plugging the efficiency till I get the IBO spec of 283, then plugging in your #s. I have found that calculator to be very close, within a few ft/sec.

I am gonna guess that you are in the 240-245 f.p.s. range! My 02 Hoyt MT Sport with ZR200 limbs, 30" draw, 70#, 420 grain arrow, peep and string leechs on string, I was getting 244 f.p.s.

Why did you use 1.25 for the ratio Buckfever or where did you get it?

It doesn't matter whether you use 1.25 or 1.15. Most bows are in that range. Depending on which you use you'll come up with a different number for efficiency but it doesn't matter as the final estimate will be the same, you'll still get 253.

What do you think I have for string add-on?

I didn't figure for string add on, I just use .1, so that it'll do the calculations. I think folks report the leaches take 2-3 ft/sec., the loop won't do much if anything.