Hi,

Please bear with this long question but I'm a bit confused.

I used the arrow spine calculator as offered on 3 rivers archery site? By entering my bow information and arrow information it supposedly calculated the a matching arrow spined for the dynamic the energy of my bow.

For example, I found a 30.75 inch 3 Rivers Carbon arrow at 9.1 GPI with 14 grain insert and 150 grain head, plus nock and feathers gave me a total weight of about 465 grains or +9.2 grains per pound. This current set up seems to work well with my bow.

My question is: I often read threads about guys who front load their arrows by adding insert weights and using super heavy heads. Doesn't this throw off the correct arrow spine for the bow? Am I doing something wrong?

You add the additional weight to your point weight. And yes, adding weight dynamically weakens the spine. Go back to the calculator and add an additional 39gr to the point weight, as if you where going to use a 50 gr insert. See how the calculated spine changes for the arrow.

Wink this has long been discussed on this form. I guess If you like to tinker with point and nock weight, and that's your thing, then go for it. I've been bow hunting for 63 years and never got into all that. My arrows fly as true as they can get. You said your arrows work well with your bow. If so, don't worry about it. Just shoot and enjoy. If you start having problems then that's the time to look into a solution. Probably lot of people on here will disagree. That's just my personal opinion.

That's taken into account with the charts. I never use charts because I've don't it myself for so long, but adding FOC requires a stiffer arrow to start with, depending on how much FOC you are wanting. Some folks overthink this stuff.

You are right if you want to load up the front you go to a stiffer spine. >>>----> Ken

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