ORIGINAL: Black Stick
You have a problem. Your draw length is pretty short, but you could get the 82nd which has an IBO of 350 fps. You loose 15 fps/ inch of draw that you go down from 30" which is what IBO is measured at. If you are feeling strong you can get the 80lb limb option. Each pound you add to your draw weight, you gain 2 fps. You can also get it super tuned by your pro shop if they know what to do. That will add speed and make it shoot smoother. You might walk out of there 10-20 fps faster after a super tune, depending on the bow and the quality of tuning. I know that the PSE X-Force (350 fps IBO) can be super tuned to 370+. If you went with that rout, you would be shooting 310 fps- 320 fps at 70# and a 27.5" DL. I don't know what a super tune would do to the 82nd, but I about to find out because I am going to call terminal velocity archery tomorrow.
80#'s on an 82nd??? Better check with your BT dealer again, I don't believe they make them, not even on a special order unless the info I heard before was wrong, but I got it from a pretty reputable BT dealer, when a "speed-freak" buddy was wanting one. You're still trying to catch speeding bullets I see. But I think we've been over the 80# 82nd thing before haven't we???
When you start getting into some big tournaments send us a link to your score and some pic's of your trophies.
Oh, I read that you found that out, I bet your dealer is as honest as your are then, huh???
ORIGINAL: Black Stick
My pro shop misinformed me of the stats on my setup. I was doing some tuning and measured the weight on my bow. It's 73, not 83. So I called Bowtech to find out if there were 80 lb limbs available, and the answer is no unless you have a Guardian. Not happy. So I put it through the chrono and got a disappointing 340 fps.
That means that there is something wrong with the chrono at my pro shop. I'll let them know. (I'm sure they'll appreciate that!!!
) I'm not mad, I just need to find an other way to be the fastest.
Try this calculator, it's been real close on every set-up I've put on it....
http://thearcheryhut.com/calculators.php On OT2 (which is usually guestimating fast) and a totally clean string, not even a loop, you'd rate to get 340, so if you think there's something wrong with the chrono, I'd agree, I think it's likely reading FAST by about 10fps or so.
Maybe you should try to put your numbers on a calculator and see what if gives your for a speed. What's your BC say your bow would shoot???
ORIGINAL: mobow
I'm not gonna break into the physics of all this, but there's more to a pass through than speed. In fact, there are many instances where you will get better penetration from a slower arrow. Speed is only a part of the equation, arrow weight is the biggest factor. Light arrows slow down and lose energy faster. For deer sized game, it's a moot point. But if you're hunting bison, as in the above scenario.....I would take a 600 grain arrow flying 250 over a 350 grain arrow flying 310 any day of the week and twice on sunday.
Mobow,
You're 100% correct, and most of us know and understand this, but you're not gonna tell a guy who already knows everything anything different than he "knows." I've yet to see an 82nd that said it would shoot 350fps on it's BC, so I'll save my breath on
Matt/NC,
Assume you're IBO is 318 - ish, and use this calculator,
http://thearcheryhut.com/calculators.phpit's pretty decent, actually I believe it's more accurate than OT2 from what I've toyed around with. If your desires are for North American game, I believe you should be just fine with about any BH using that 380-390gr arrow, but spine may be an issue. If you're looking budget the same arrow in my signature in a 55/70 spine perfect with your set-up and you can get them for about $50 or so a dozen, and they will weigh in around 375-380-ish, and a 28" shaft, you'd be perfectly spined. I know a lot of guys think you should cut your arrow shorter, but adding that 1 - 1.5" can make a big difference in both spine and FOC. I've been thoroughly impressed with them, and have RH'd half a dozen of them over the years with 3 different bows. Other arrows that match up nicely are Easton ACC 3-49, FMJ'S in 400 series, Beman ICS in 400 series, which have the exact same spec's as the Cabela's Arrows I've been shooting for the last few years, but I think the Cabela's arrows are more consistent, and if I shoot a handful of both, the ICS's are the ones that are flyers in comparison to my other arrows very consistently.