Another question on 100 vs 125 grain.

burniegoeasily · 08-12-2003, 04:16 PM

Thanks for the suggestions on my first post. I have started setting my pins with 100 grains. I shoot a stiff spine shaft and like the idea of a little less weight.

I shoot carbon express, game tracker terminator shafts 6075s. My bow is set at 63lbs. I shoot double cams. With this extra information, am I on the right track with the 100 grains, or should I go back with 125s? I have noticed I have had to retune my bow with 100grains. I keep getting a right tear with the hundred grains. I have just about got rid of the right tear. Is this normal when you lower your tip weight, or am I over spined?

I should also add that my shafts weight 10.7 grains per inch. I shot a 29 inch shaft making my shafts weight 310.3 grain. Im not sure what my inserts weigh. So roughly with a 100 grain tip I have a total weight of 410 give a little for the insert. at 125 grain tip I have a 435 total weight. Your thougts would be appreaciated.

Danny45 · 08-13-2003, 11:50 AM

Lowering your point weight does two things. It does stiffen the spine, and it changes your Forward of Center (FOC) balance. I' ve never paid too much attention to the FOC myself. I' m not sure about your inserts, but for aluminum shafts, they can be anywhere from 35-55 grains, according to Easton' s charts.

If you have your centershot okay, and you' re not tearing high or low (which would cause you to move your nocking point, you might try adding a couple of pounds to your draw weight. That may be all that is needed to get rid of your right tear in paper. How does your arrows group? Before going thru the process of completely retuning a bow, if I make a change with the arrows, I adjust the draw weight a little. It' s the easiest to do.

Hunt2Kill · 08-13-2003, 11:55 AM

I am one who believes the 25 grains does not make much of a differance. Ive read many articles and no one seems to be sure what is the best to shoot. Shoot em both, whatever one feels more comfortable and has a better pattern, use them.... When uve got a buck at 25 yards, the 25 grains isnt gunna make a differance. Hes gunna be down :-)

burniegoeasily · 08-13-2003, 12:12 PM

Danny45
My grouping is great accuracy is still good. I keep a very tight group, I just have that right tear that is bothering me. Ive only shot twice since changing, and found it odd that I had developed a right tear. Up and down is ok.

I have been shooting bows for years by my self and tend to quit looking at the tech. aspect when I get some thing going right. Up until last year I shot aluminum arrows with and over draw. I got rid of the over draw and changed to carbons last year once the season was over. Since then I have been changing things as I go. I live over an hour away from the nearist bow shop, so what I know has been through trial and error, and with help from you good people. I was just curious if my spin was too much for a hundred grain.

Thanks kent

Arthur P · 08-14-2003, 07:56 AM

My question is why are you so hellbent on shooting 100 grains heads?

Like I told you on the other thread, there is absolutely NO benefit to dropping the tip weight and the only reason to do so was to stiffen your arrow spine. Obviously, you did NOT need to stiffen your arrow spine. The good news is you can stick the 125' s back on there and be back in business.

Mahly13 · 08-14-2003, 10:42 AM

If they group well, who cares what they do to paper?

burniegoeasily · 08-14-2003, 11:20 AM

Arthur P
I have gotten significant increase in fps and a significant improvement in
flight. Like I mentioned Im shooting a heavy shaft 10.7 grains per inch. I
wanted to lighten things up with out going to new arrows. When I
chronograph the two It was a substantial difference (average of 10fps). My pins have all moved up and my 60 yard pin is no longer on the bottom of my sights. I can now set me a 70 yard pin if I want without having to move my rest.

Im not sure what an arrow does when over splined that is the premise of my
questions here.

I appreciate the help. I did find out why I was getting a right tear last
night. I videoed my shot and found that I was holding the bow too far from
my body, causing me to pluck the string when I released. I fixed it and am
now back on track.

Arthur P · 08-14-2003, 12:59 PM

Thanks for easing my curiosity. Awful hard to believe you got all that just by dropping 25 grains in tip weight but, okay. Whatever floats your boat.

burniegoeasily · 08-15-2003, 11:11 AM

Arthur
I could be lieing, I havent calibrated my cronograph in a while. I lost my tuning forks and havent had any thing to calibrate it with, I could be a little off. My brother is coming tonight with his tuning forks, I guess Ill know the exact fps tonight.

timbow2 · 08-15-2003, 04:58 PM

I' m not trying to stick my fat nose in your business but it does seem odd you would have to move your pins that much. I went from a 125 head to a 160 and my pins did not move. and with a heavier head you will pack more punch.