Slow speed on my GT 500

[customarcherysupply]

I just put a 29.5" cam on a GT 500 that was 27". It is pulling about 71 lbs and I am shooting a 375 grain arrow. I am only getting 308 fps on my new pro chrono with a fresh battery. Any advise this seems slow for a 29.5" draw length?

[customarcherysupply]

I only have a string loop on the string nothing else.

[kydirtbag]

Try this link and it'll tell you...http://www.bucklemke.com/ke/ke.php
I used it and my GTO is right on.

[customarcherysupply]

Thanks but it shows I should be at 332 which is what I would expect. Not 308.

[kydirtbag]

I'm not sure...I'm not use to having a bow with so much speed. My GTO is shooting 284 fps at 60# and 29" with a 384 gr arrow. The most I ever got out of a bow before that was 260-262.

Sorry I didn't really help. Do you have all the speed nocks still on the string?

[vhunter]

Looks to me like your pretty slow. I'm shooting a 70/30 with a peep and loop with a a 415g arrow and I'm getting about 310. You might want to check your cams to make sure there in sync.

[TX Rattlesnake]

Try this link and it'll tell you...http://www.bucklemke.com/ke/ke.php
I used it and my GTO is right on.

Put me within 1 fps of what I shot my GT at the shop the other day.

[archer58inPA]

Check your ATA,BH and DL.
Unles you're WAY out of spec., I would say the chrono
is the problem.
I have a ProChrono and it will read funny
w/ indoor light. Up to 20fps. off.
Take it outside and shoot through the very middle of it.

[customarcherysupply]

I am thinking chrono also. I have a new light kit on order. I have a very old light kit now. Also I am wondering about dust down in the sensors. Has anybody ever had that problem?

[GRZIP]

30 inch 62lbs 375grains on my chrono 301 fps, but I need to print a 315 fps tape from OnTarget to match, so I think my chrono is slow... (it is compared to another the bow has been shot through)