Sniper151

gru, you have a heavy arrow, but an extremely good one for hunting. Your set up will blow through all medium and big game and more than enought kinetic enegry if you decide to hunt elk size game. If your interested in 3-D shooting you may want to choose a lighter aluminum arrow.

Sniper151

Olink, I have no idea what program your using, but if that software is telling you that a 550 grain arrow at 255 is going to deliver the same kinetic energy as a 400 grain arrow at 280, their are blowing smoke up your butt. Take your baseball and throw it against your garage door than borrow your wife's bowling ball and throw that at the same door. Now tell me which one has more kinetic energy. The fast baseball with little weight or the slower bowling ball with 10 times the weight. Same same when throwing a javaline, shooting a bow or your favorite bullet.

CLOUD 9, MN

40 yards is a long ways in actual hunting conditions. 30 yards your set-upis fine. But 40...unless your a fanatical great shot......the deer is broadside......looking away.....standing still......with no wind......and you got your range finder on it....pass. There's way to opportunities inside 25 that are almost automatic. You can practice 3D all day at 40..50 and 60 and pipe the kill zone....but on a live deer at 40 its another story.

Good Luck!

Olink

Sniper, I don't know whose post you were reading, but it sure wasn't mine. I didn't use any of the numbers you stated in your post. The Archery Program is a VERY well respected estimation tool, and I challenge you to find anyone who has found errors in its calculations.

bowhunterlimerick

i did that thing is junk

BGfisher

Sniper, where did you get those numbers from? I don't remember seeing any of them in this thread.

Did you you guys read the post by datamax? It's true. I know for a fact that ton's of KE are not necessary for deer. In fact 24lb/ft is adequaite if the person shooting the bow does his part. This KE arguement does really get pretty old and shows where the amateurs are. Prett much, I figure that any person who has to ask this question has more than enough with their setup. OR do they think they need more "power" to compensate for their shooting ability?

silentassassin

If I was going to throw both of them at you as hard as I could, which one would you rather get hit with? The bowling ball because I only have X amount of energy with which to throw a blowling ball and while it my have more KE, I can't get enough speed from it to hurt you. With the baseball on the other hand I will be breaking some bones if I hit you with it. Those two comparison aren't really valid here considering the extreme differences in weight. All that being said you won't see more than 1-2 foot pounds of difference when going from say a 300 gr. arrow to a 500 grain arrow. Also, there is something called the law of deminishing returns. In other words a cam may more more efficient up to a certain weight and any extra arrow weight you add after that point will actually decrease efficiency.

BobCo19-65

How about if we rolled them? [8D]

datamax

Talk to compound shooters and they think they need 70 pound bows shooting 300 grain arrows so they can get a KE calculator to tell them they have 60 pounds or some arbitrary number and its almost laughable.

Talk to any trad shooter who shoots 650 grain wood arrows from 50-55# bows with speeds at maybe 170-180 fps and ask them about KE.

Truth is a sharp broadhead on the end of an arrow will kill ........ ya'll are arguing about how many inches you'll stick the arrow into the dirt on the other side.

This ............ from a 52# longbow, 525 grain carbons, a Thunderhead 3 blade and the shot was 18 yards.

Sylvan

silentassassin wrote: A bow with 100 grains virtual mass throwing a 300 grain arrow 280 ft/sec WILL throw a 500 grain arrow at precisely 228.6 ft/sec. In terms of KE thats 52.2 ft/lbs vs. 58.0 ft/lbs respectively or a 5.8 ft/lb increase. In terms of efficiency the bow transfers 75.0% of its energy to the lighter arrow and 83.3% to the heavier. This is not opinion its is mathmatical certainty. You are simply incorrect when you say you won't see more than 1-2 ft pounds of difference. Also, with regard to a point of diminishing returns in efficiency, efficiency always increases with arrow mass at least over a practical range of arrow weights.

Although I disagree with your numbers I do agree with the point you are making. The difference between 50 ft/lbs and 60 ft/lbs is, as datamax said, how deep the arrow goes into the dirt after passing through the deer.