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Old 04-19-2012, 12:26 AM   #1
Konovoloff
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Default Help with arrows

Well I've been looking to get into hunting for a while. After debating wether I should get a gun or a bow, I got a bow, just because it seems like it would be more of a challenge. Plus there's an indoor archery range about 3 blocks from my house. I bought a Bear Outbreak, 70 lb for my first bow. The dude sold me some arrows, but I never really bothered to ask him anything about the arrows. After doing a little research I've now found out there is a lot more to arrows than I thought.

I was wondering if anyone could give me a quick run down on the arrows. I know the names of the different parts of the arrows and thats about it. If Im currently shooting 60 LBs on my bow @ 29" draw, then what arrow length/weight should i shoot? And how do I figure these things out myself?

Also, what does "Dia .300": Spine .487"" mean, and how do I figure those things out as well?

The current arrows I have are easton carbon powerflights. It says 400 8.4gpi on the side.

1 more thing is how do I know what kind of cams I have on my bow? Hard, medium, soft?

Last edited by Konovoloff; 04-19-2012 at 12:42 AM.
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Old 04-19-2012, 04:45 AM   #2
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5gr per lb of draw weight is the minimum and I like 6-7gr per lb on a hunting arrow. Any newer bow should be considered as a hard cam. 400 size is the correct size for a 29" arrow and 60# (assuming a 100gr point) Most people choose a length so that it is 1" beyond the rest when you are drawn. I like it a little longer than that. Shaft diameter is important to 3D shooter who want the very slight edge a fatter shaft gives them for cutting a scoring line; for the hunter - who cares.
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Old 04-19-2012, 10:24 PM   #3
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So if I went into an archery shop and said "I need a 29" arrow at 350 grains" they wouldnt look at me like im retarded? And on the easton chart on their site, it says "size" in one column, and it says 400, 350, 1200, etc. Whats that the size of? And why dont they have the actual measurement of the arrow anywhere in there
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Old 04-20-2012, 04:31 AM   #4
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No, they won't be able to give you a weight. You order by size (400, 500 etc), length and what you want for fletchings Duravanes, Blazers etc. The size is selected by draw weight, arrow length, point weight etc so the spline of the arrow is correct. Actual arrow weight will have to be calculated by adding up everything. point, nock etc.; that's why they give you a gpi for the shaft - ie 6.5gpi and a 28.5" shaft = 185.25gr for the shaft.
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Old 04-22-2012, 10:16 AM   #5
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The arrow's spine number (300, 340, 400, 500, etc . . .) simply means that when the arrow is placed in a testing device supported at two points 26 inches apart, and a 2 lb weight is applied to the midpoint of the arrow shaft, the amount of deflection as measured in thousandths of an inch is the arrow's spine rating. So if an arrow deflects .400", it's a 400 spine weight arrow. GPI is "Grains Per Inch". Your Easton Power Flights weigh 8.4 grains per inch. There are about 15.5 grains in a gram. The less deflection (lower number), the "stiffer" the arrow.

That is called a static rating. In a dynamic environment (arrow actually being shot from a bow) two other factors come into play. the weight of the arrow point, and the amount of force pushing the arrow (draw weight and to a lesser extent cam "aggressiveness"). If there is a heavy weight up front, and a lot of energy pushing the arrow, it will flex more as it comes off the bow than an arrow with a light point and less energy.

So, how do you order an arrow using the Easton arrow size chart?
First figure out how long your arrow need to be. This is necessary because the dynamic spine of an arrow will change with it's overall length (with alike points - a longer arrow will flex more than a shorter arrow). Get a helper with a Sharpie marker and have him/her mark where on your arrow touches the arrow rest when you are at full draw. Measure from the nock groove to the mark. Add 1" to this number. Let's say you got 27.5" at the mark, add an inch and you're at 28.5".

Next, figure out what cam you have. In my opinion, this doesn't make a huge difference. Very few hunting bows have soft cams, consider yours Medium or Hard. On the Easton chart, beneath the Cam selection, they list a range of bow speeds. Look up your bow's IBO speed and see if it falls into the "Hard" or "Medium" range. I'd guess yours is a "Hard" cam. Now go to the Easton Target Chart (or Hunting Chart, but for this example I'm using the Target Chart). Under the Hard Cam column, move down until you get to the 55-60 lbs row or the 60-65 lbs (I'd use the 60-65 lbs range as your bow is probably 60-70 lbs draw weight range). Now, move across until you get to the column under the arrow length (in this example 28.5"). It says "T10".
Beginners Archery Range
Now find the Group T10 arrow list and that will give you a range of Easton arrows which will be properly spined for you bow. Keep in mind that this is a range with the "weakest" arrows at the top of the list, and the "stiffest" arrows at the bottom (they are also separated with carbon on top and aluminum at the bottom). The arrows followed by the letter "R" are recommendations for recurve bows.
Beginners Archery Range
From the chart, 380-440 spine is correct. Easton breaks it down by their arrow line-up, so you'll need to decode which Easton arrow is listed. Their economy arrows aren't listed, so your Power Flight's aren't listed specifically, so just go by the generic 380-440 range. Your 400 Power Flight's are right down the middle.

As you get more experience, you can experiment with changing how an arrow tunes by changing point weight, or arrow length. It may take some pondering before the relationship between static arrow spine rating and dynamic factors such as point weight/arrow length/draw weight become clear.

Last edited by Praeger; 04-22-2012 at 10:30 AM.
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Old 04-24-2012, 10:48 AM   #6
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Default Easton Shaft Selector

Here's another option, Easton now has an on-line shaft selector program.
Enter your data and it'll make a recommendation.

http://eastonarchery.com/store/shaft_selector/
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Old 05-21-2012, 01:41 PM   #7
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and don't forget that the longer the arrow, the more spine you will need. Most recomendations are for a 29" arrow length. I personally use a 32" arrow with my 30 inch draw length which means I go up one level in spine from the recomended. It is also better to err to the stiff side as they will fly better for you than an arrow that is too soft in the spine.
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