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75 grain or 100 grain Broadhead

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letrfly27

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Ive been doing a little tuning on my set up and have come to a question that I need help with. Do you think that switch from a 100 grain to a 75 grain broadhead would be a good idea? As far a kenetic energy goes, I am currently shooting 68.4 ft lbs of kenetic energy with a 100 grain tip at 295 fps. If I switch to a 75 grain I will only loose 2 ft lbs makeing it 66.6 ft lbs of KE but I will be shooting around the 302 fps mark. Do you think the extra 7 fps are worth looseing the 2 ft lbs of KE???

On a side note. My arrows are 11.5% FOC with the 100 grain tip and with the 75 grain it would make it 8.8% FOC with a proper balanced arrow being between 7 and 10% FOC. Puting the 75 grain with a better FOC. Having said that my arrows fly great and look wonderful paper tuning so this is really note a major issue but I thought I would put it in here for a little more info on why I may be concidering the 75 grain v/s the 100 grain. Thoughts....please and thank you.
 
For target (3D) shooting the lower FOC% would be fine, but for hunting your FOC% should be between 10-15%, and no the extra 7 fps gained are not worth giving up the ke. I would leave it the way you had it with the 100 grain tips on there. Another thing that alot of people fail to consider is what a change in the front of the arrow will do to the spine deflection of the arrow, and that can negatively impact your actual tuning�provided you were properly spined right to begin with.

Below is a pretty good article on arrow mechanics, although the article is slightly dated and he is using extremely heavy arrows, I believe you can undertstand his points behind the message.
http://www.alaskabowhunting.com/PR/Ashb ... Arrows.pdf

http://www.huntersfriend.com/carbon_arr ... pter_4.htm <<<< good calculators here and more FOC info
 
I agree with you. I guess I just needed to hear/read it from someone else. As far as being properly spined, I am right where I should be with the 5575 Gold Tip Pros. I didnt think about the deflection. Know I need to decide if im goin to stick with my meat seekers or try something else this year. Either way 68.4 ft lbs of KE is more than enought for a whitetail or a elk.
 
Don't over complicate or over think bow shooting man. Just go with what shoots the best. And if they both shoot good, then go with whichever broad head you can find easier in stores. In most cases this will be 100 grn.
 
knightrider said:
if i was going to change anything it would be to 125 for hunting for more foc
Click to expand...

Yes, but that will weaken the spine and very well may result in the need to change to a stiffer spined arrow if it is perfectly spined now. However, your correct--the higher the FOC, all things being equal, the better penetration an arrow will get when compared to a lower FOC.
 
TNDeerGuy said:
knightrider said:
if i was going to change anything it would be to 125 for hunting for more foc
Click to expand...

Yes, but that will weaken the spine and very well may result in the need to change to a stiffer spined arrow if it is perfectly spined now. However, your correct--the higher the FOC, all things being equal, the better penetration an arrow will get when compared to a lower FOC.
Click to expand...
yes, but reading he only has 68ftlb of energy and is shooting 55-75pros he should have plenty of spine to handle the extra 25 grains for added foc :grin:
 
If I use a 125 grain tip it would increase my FOC to 13.9% but will slightly reduce my KE from 68.42 ft lbs to 68.37 ft lbs. But if you use the rounding rule they both equal 68.4 so I dont guess im really loosing anything there. According to Easton recommendation on KE being 25-41 ft lbs for deer and antelope, 42-65 ft lbs for elk and bear, and >65 for cape buffalo and grizzly I would feel great shooting either one of them knowing I had more than enough KE for anything I will ever be able to hunt. I guess I need to pick up a pack of 125 grain and do some more test and tune. Any recommendations? Mechanical or fixed, it doesnt matter....yet. The Striker Magnums have a huge cutting surface! I also here good things about the Grim Reaper Razor tips.
 
one of my favorite all time heads is a 125 grain thunderhead,and the strikers are great to if they fly good out of your setup[which properly tuned they will] 100 or 125 the deer dont care which one it is but the 125 have just been good to me over the years
 

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