# Thread: 350gr arrows too light??

1. ## 350gr arrows too light??

would a 350gr arrow be too light for moose, caribou or grizzly???

any thoughts???

Thanks!

2. ## My opinion

I would feel comfortable shooting a bou with your 350 gr. set up but would chose a heavier arrow on the moose and bear. Something over 400gr. Even with the loss of speed going to a heavier arrow I think the penitration would be better.

3. Momentum is penitration KE has nothing to do with penitration. The mass or wieght stays with the arrow as it slows down in the air or during penitration. Speed is always decreasing so if two arrows have the same momentum the one thats is heavier will penitrate more.

Mass X velocity = momentum
Velocity is always fleeting so as velocity decreases so does momentum.
If you like KE Mass x velocity squared = KE
And that means KE is decreasing at an xpotenial rate as its velocity decraeses and thats a losing battle.

There is small window for each bow and its draw wieght where you can shoot a lighter, a heavier, or a conpermise wieght arrows to either get flatter trajectory or more penitration but never both. and one will have better wind drift/be less criditcal of bow setups and operator errors.

Generaly a combined arrows/broadhead wieght of 500grs will work for #60 and up bows. At 60lbsyou need the wieght and at 65/70/75lbs the same wieght with the extra speed has more penitration and flatter trajectories too. In the end how much penitration is actualy required for each game spieces?

4. ## Arrow weight

would a 350gr arrow be too light for moose, caribou or grizzly???

Yep! too light by just about 300 grains. Look toward the 10 grains per lb of draw weight fact as a minimum for big game. You'll find better arrow flight, a quieter bow and much better penetration. If you're drawing a true 64 lbs on your bow than look to about 650 grain arrow as a starting point. Best would be to put those additional 300 grains right at the pointy end of that arrah.

And no, I'm not a bit jealous that you're going to bowhunt Bullwinkle.

Tjen is spot on regarding the KE issue. As bowhunters we should be looking toward the momentum and leave the KE for the target shooters.

5. Having seen several moose kills with 350-400 grain setups I would not hesitate to use one. In fact, my arrow setup is currently at 410 grains and I use it to hunt for everything in Alaska. This debate will do on as long as there is bowhunting. The single most important thing is to have the ability to hit both lungs.

6. If we are talking about a 350 grain raw shaft before tipping, fletching or FOBing it, then it's plenty for moose. I don't think I'd seek an overall weight of 350 grains ready-to-shoot, though.

I've taken 3 bull moose with Carbon Express 350's with Blazers and Muzzy 125's. Collectively, my three moose have traveled less than 100 yards once they were hit. I wouldn't expect a pass-through, though and one is really not necessary.

This year I'm dropping down to 100 grain broadheads for more speed and a little flatter trajectory.

I'll report on that as well.

Taylor

7. I too am a momentum kind of a guy, as well as shooting trad equipment & favor the 10 gr+ per # of draw weight idea.

8. Most of my combind arrow/broadhead weights are between 500grs and 520grs. This is for cedar's, XX75's, and wieghted beman #340's. I shoot these in either my recurve's (#60) or compondbow (#65). Just for example this has worked for 100% and even complete pass throughs on caribou, moose, elk, and countless black bears by dozens of my archery club members using #56 to #65 recurves using two blade heads. Many were Alaskan game animals.

9. Now i'm not feeling so bad about shooting a moose with my heavy 520 gr XX75 Gamegetter 2115's.

11. Check out these links: http://www.martinarchery.com/faq/facts.php ; http://nativeskills.madduckoutdoors.com/penitration.htm ; http://www.huntersfriend.com/2007-Ca...ion-guide5.htm ; http://www.goldtip.com/calculators/kinetic.asp . KE Equals penitration and increasing arrow weight by 100gr will only give you an increase of 5% in KE if velocities remain equal, which is highly unlikely because heavier arrows take more energy to push at the same speed as the lighter arrow. I shoot 370gr total weight arrows and generate aprox 65 to 69 lbs of KE. Most references, and there are many, agree that even the heaviest and most dangerous game only requires a minimum of 65lbs of KE. The IBO speed ratings of your bow should be reduced by 5 - 7 % to determine your arrow speed if you do not have a chonograph. I would stay on the conservative side and go with 8% and determine my arrow KE based on that 8% reduction in arrow speed. If you have over 60lbs of KE you should have enough arrow to penitrate the vitals of a moose. http://www.archeryhq.com/kin.htm

12. Thanks for the links, looks like i'm good to go with 63.78 lbs of KE.

13. Shuttle T's. They group very consistantly with my setup.

Taylor

Brent

15. A 350 gr at nearly 300 fps will most likely go right through a moose.

My arrows are 410 gr at 260 and they go right through moose.

16. Originally Posted by okbowman

Brent
By engineering definison KE is not even a measurement of a mass"s ability to keep moving.. Its is only Mass X Velocity all day long any day. I can put thousends of lbs of pressure on something and with just a few .001" of movement can completly releave all the pressure. KE sometime though of as PSI and that is still not a measure of penitration. To make it simple calulate your momentum and then concider what resistance your type of broadhead will have. And remeber KE is dropping at an expotential rate as its velocity component drops, not with momentum. Its the pinpong ball, gulf ball comparission.
I once took a kids bow the one for tots with the suction cup arrows and made crossbow launcher for ping pong and golf balls. shot it through a crony and then ask who disagrees , now who wants to put there head three foot in front of this for a first hand demenstration. I had not takers point was obvious. There is a window for each bow and its draw weight where you can go lighter/heavier, or some where in the middle for more penitration, flatter trajectory, or a compermise, BUT NEVER BOTH.

And with archery the fast the arrow the more cridical it is to lauch and of any arodymanic force it incounters in flight.

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