I have a conundrum.
Until recently I was shooting my Stolid Bull 25? ILF riser with medium Hex 5s 38# limbs pulling 39 OTF. 8125G 18 strand string. Brace height 7 7/8?. Nock height 1/2?, true center shot and zero tiller.
My arrows are 27 3/4? ACE 570 spine with 100gr break off points, Easton pin nock, Beiter #2 asymmetric nocks and GasPro 1.75? shield vanes.
Total arrow weight = 296 grains (well above Borders? recommended weight). GPP = 7.58 and FOC = 15.3%. I shoot three under barebow.
That was my ?best tune? but the bow was NOISY and I couldn?t group bareshafts. Lower BH gave me contact with the riser and plunger setting and tension made no difference.
I know from others on this forum and Border themselves that neither the Sids nor Holger (who makes the BT) recommend pairing this riser with Hex limbs above 6 but Holger has a video of him shooting the BT and Hex 5 limbs.
Taking Sid?s advice, I have now changed the string to a 14 strand FF.
This significantly changed the tune. The bow is now pulling 35#, the arrows were acting (not surprisingly) stiff, my BH had to go up and the bow is still noisy. No matter how I fiddle I can?t get bareshafts to group - I even tried some old ACC 3L-04 spined for 36#, and both sets of arrows going porpoising down range no matter what nocking point height I try!
I?ve been trying to tune this rig on and off for pretty much a year now and I?m completely stumped.
I?m considering going for some suitably spined heavier arrows that will give a GPP over 10 to see if that improves matters.
Or perhaps some more conventional profile limbs - CVXs perhaps?
Or, heaven forbid, changing the riser - maybe a Tempest?
I?d be grateful for the thoughts of any wise heads out there..
Thanks in advance
Kerf
Until recently I was shooting my Stolid Bull 25? ILF riser with medium Hex 5s 38# limbs pulling 39 OTF. 8125G 18 strand string. Brace height 7 7/8?. Nock height 1/2?, true center shot and zero tiller.
My arrows are 27 3/4? ACE 570 spine with 100gr break off points, Easton pin nock, Beiter #2 asymmetric nocks and GasPro 1.75? shield vanes.
Total arrow weight = 296 grains (well above Borders? recommended weight). GPP = 7.58 and FOC = 15.3%. I shoot three under barebow.
That was my ?best tune? but the bow was NOISY and I couldn?t group bareshafts. Lower BH gave me contact with the riser and plunger setting and tension made no difference.
I know from others on this forum and Border themselves that neither the Sids nor Holger (who makes the BT) recommend pairing this riser with Hex limbs above 6 but Holger has a video of him shooting the BT and Hex 5 limbs.
Taking Sid?s advice, I have now changed the string to a 14 strand FF.
This significantly changed the tune. The bow is now pulling 35#, the arrows were acting (not surprisingly) stiff, my BH had to go up and the bow is still noisy. No matter how I fiddle I can?t get bareshafts to group - I even tried some old ACC 3L-04 spined for 36#, and both sets of arrows going porpoising down range no matter what nocking point height I try!
I?ve been trying to tune this rig on and off for pretty much a year now and I?m completely stumped.
I?m considering going for some suitably spined heavier arrows that will give a GPP over 10 to see if that improves matters.
Or perhaps some more conventional profile limbs - CVXs perhaps?
Or, heaven forbid, changing the riser - maybe a Tempest?
I?d be grateful for the thoughts of any wise heads out there..
Thanks in advance
Kerf