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Main Boards => PowWow => Topic started by: starshooter on October 03, 2018, 08:45:00 AM

Title: Safe GPI threshold for recurve bow
Post by: starshooter on October 03, 2018, 08:45:00 AM

I just recently acquired a beautiful JavaMan “Helms Deep”.  Want to to shoot some carbons out of it . I have a GT 600 Entrada test arrow rated at 5.9 GPI.
I inserted two (2) 20 gr. Bushings into the arrow and tip with 125 gr field point. If my math is right I get a 8.0 GPI . With three feathers , an insert , and nock the GPI is over the minimum threshold. Would this be safe for 41 # pull??
I have shot Easton Legacies XX75 1916 and while they shoot ok out to 15 yds they drop down range. But the good thing is that a 10 GPI the bow is very quiet and smooth. So my question remains is a 600 carbon at 5.9 too light and not good for the bow( dry fire)? Love to hear from any of you who shoot Greg Coffee’s beautiful bows. Thanks

Title: Re: Safe GPI threshold for recurve bow
Post by: Ari_Bonn on October 03, 2018, 09:14:59 AM

What you really want to be looking at is   gpp (grains per pound, total arrow weight divided by pull weight)        i wouldn't personally shoot less than 8 gpp   not to say the bow couldn't handle it most bowyers use smooth on these days and should have no problem.     best to check with the bowyer for warranty reasons since some wont warranty a bow if you use less than 8 gpp.  plus less than that   you really are getting diminishing returns for speed.

Title: Re: Safe GPI threshold for recurve bow
Post by: Friend on October 03, 2018, 09:20:12 AM

You Bowyer has the reliable answer to your inquiry.

Title: Re: Safe GPI threshold for recurve bow
Post by: the rifleman on October 04, 2018, 05:34:25 PM

Imo 8 is as low as I'll go.  Im usually more around the 10-13 gpp range as i hunt w lighter poundage bows. 

Title: Re: Safe GPI threshold for recurve bow
Post by: starshooter on October 05, 2018, 01:17:04 PM

John , you’re right. Talked with Greg and he indicated the 9 GPP would be much better. I might order some 8 s and build up the weight.
It’s going be 1916 legacies for now (10 GPI 28 “  + 125 gr points)
Those carbons are varied and confusing I have taken notes on the weight specs
For all the components , added them up and divided by my power ( 41#) . Can be done.. the actual length will be problematic as I don’t know if my cutoff saw would be good to use.( Hatbor Freight). I need to start with 30” and pare down incrementally.

Title: Re: Safe GPI threshold for recurve bow
Post by: the rifleman on October 05, 2018, 09:42:58 PM

If you're using 1916s you can use a small pipe/ tube cutter.  I then use a reloaders chamfer tool inside and outside of the cut.  Best of luck.