I'm shooting a PSE Nova. Pull is set around 64 lbs. Shooting Beman ICS Hunter 340 at 29".
Have been shooting 125 gr heads, decided to drop down to 100 gr. Minimum arrow weight listed on the bow is 360 gr.
If my calculations are correct -
270 gr (9.3 gr. / inch X 29") shaft
21 gr for insert (from Beman's website)
13 gr for nock (from Beman's website)
100 gr for head
20 gr for fletching (I'm just assuming, I have no numbers for fletching)
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That's a total of 424 grains for the arrow.
Too light? Just about right? Should I go back to the 125 gr heads? There wasn't really any change of point of impact when I switched from the 125's to the 100's.
Would I really gain any significant speed & energy by dropping from 125's to 100's? Would maybe dropping to a 90 grain head have any adverse effects?
The minimum grain arrow on my bow is also 360 grains. I was told that I could go under this. I shoot a 328 grain target arrow and 363 grain hunting arrow. Also speed isn't important. (Read the signature) If you get more speed by dropping arrow weight, then you won't get more KE.
I'm not really worried about speed, per se. This thing is pretty darn fast the way it is. I just wonder if I'm gaining anything by switching to a 100 gr head.
If not, that will save me about $30 in not buying new Muzzy's.
You won't have any significant gain in speed. Maybe 5 fps. The change will have more dramatic effect on your spine than anything else. If you were on the edge of being underspined with the 125's, the change will help. If you were in the middle of the arrows' spine range anyway, then you probably won't see any difference at all.
FYI, 4" vanes avg about 8.5 grains per each - varying, depending on the manufacturer. 4" feathers avg around 2.8 grains per each.
Like I said, it won't matter a whole lot whether you're at 425 or 450 grains. Let your arrow flight and accuracy make the choice for you. Shoot whatever weight tips do best.
I went with the 340's for a little extra weight & spine.
I can't really tell any difference in POI between the 100 gr and 125 gr heads. Since that is the case, I don't really see any need to buy new broadheads. My trust 125 Muzzy's will do just as well.
Arrow Weight
) If you get more speed by dropping arrow weight, then you won't get more KE.
