Equipment & Gear > Archery Gear
An offer to help
Todd_ID:
--- Quote from: bowhunterforever on August 14, 2010, 01:36:03 AM ---What can you tell me about my setup? 2010 matthews Z7, 29inch draw set at 70#, 29 inch Beman 340 ics hunters with 2 inch maxium vanes and 100 grain tips. Thanks
--- End quote ---
No problem. According to the program, you're right at the edge of legal with 6.067 gr/lb. Shows 300.8 fps, 424 grain arrow, 11.42% FOC, 85.3 ft-lbs KE at launch. Recommended spine is .314, so your .340's are weak, but may fly ok. 20-50 drop of 24.9", KE @ 50: 72.2 ft-lbs.
If you turn it down to 65# to get spine closer, then you'd get: easier draw with cold muscles, 291 fps, 6.5 gr/lb, 80.2 ft-lbs, recommended spine of .331", 20-50 drop of 26.9", KE @ 50: 68 ft-lbs.
To my way of thinking, there's simply not enough loss in any of the categories to not turn it down, and there are plenty of benefits: the second most important being much easier tuning when you get the proper spine, and the most important is not having to move bow a bit at an odd angle when drawing 10 yards from a monster bull. :twocents:
bowhunterforever:
What arrows should i be shooting beman ics 400?
Todd_ID:
--- Quote from: bowhunterforever on August 14, 2010, 10:42:47 PM ---What arrows should i be shooting beman ics 400?
--- End quote ---
The 400's would be way too weak. Think of spine as the amount an arrow bends. They put the arrow on supports at the ends of the arrow then put a 2# weight in the middle and measure the amount it bends. One that bends .300" is called a 300 spine; one that bends more, say .400", is weaker and named a 400 spine. Make sure to ask before you buy, though, because each manufacturer uses different spine-naming conventions.
Lots of IFs in the answer to your question:
IF you want to keep the 70# draw weight
and
IF you are having poor arrow flight
and
IF you need more arrows
and/or
IF you WANT to spend some money on arrows
and
IF you want to stick with the Beman ICS Hunter arrows
then
Look for the ICS Hunter 300's; they'll be a .300" spine vs your .340" spine
also IF you go with the 300's, then you could go to a 125 grain head and be dead center perfect spine with a 29" arrow and get better weight, FOC, and penetration. Other .300" spine arrows would work fine, too; think Easton Axis or Beman MFX.
Next series:
If you are not stuck on the 70# draw weight
and
If you don't need more arrows
or
If you don't want to spend more money
then
Turn the bow down to 65#. That solves all your concerns without giving much up. Look again at the numbers between 65 and 70 pound draw weights above, and you'll find that not much is lost in energy, speed, or trajectory. Lots, however, is gained by having 5 less pounds to try and draw in the moment of truth.
My strong suggestion is to back both limb bolts out 2 turns and shoot what you have. You already have more than enough horsepower to blow through a cape buffalo, so dial it down to where it'll just blow through a polar bear.
boneaddict:
I just bought two dozen arrows, and honestly they were more expensive than my ER visit after I had a heart attack when I paid for them. WOW, I tie my own flies, load my own bullets, I should be making my own arrows. :yike:
MIKEXRAY:
Arrows are getting expensive ! I'm shooting my Z7 @ 66# 29 in draw and this program & all the charts say that I am under spined with my Beman ICS 400's but the Beman chart & the two shops I have talked to say 400 is right in there. On the Beman chart I am a couple of steps away from needing 340's but all the other charts say I am solid 340. My bow shoots sweet but I have been concerned. Definitely mot getting new arrows but just pointing out the differences in charts & opinions. Mike
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