I know we have a lot of accomplished archers here, so this is prolly redundant to ya'll, but I've also noticed alot of new shooters here as well. This is just a little something I learned yesterday working at the shop.
My groups have suffered a little here lately, and I've been pretty diligent to find the answer. I asked my shop owner last night what he though, and he asked if I've tried new nocks? I hadn't given that any thought. Honestly, I just didn't think it would make that much difference. Long story short, it matters. New nocks, and she's drivin tacks again.
Moral of the story? If you've been shooting the same arrows alot, maybe try new nocks. It can make a big difference.
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Believe it or not, I've only done that once. The other times you've accused me of that I've actually left the computer and went and done something productive, hard as that is to imagine!
I agree on the new nocks, or at the very least keeping some around. I found a few X-nocks that came with some Beman Black Max arrows were loose after a few shots and actually stayed on the string after the shot. Worried that it was the shafts, I bought some new X-nocks and found some of the nocks that came with the shafts were just not fitting as well as the new ones.
greg, i think if you take a scale and figure out how many pounds of tension it takes to pull your arrow off the string - you can subtract that amount of pounds from what you're shooting to figure your ke.
ijimmy's sig line about changing your nocks frequently is for real.
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aka bucknasty
The average man seeks certainty in the eyes of the onlooker and calls that self-confidence. The warrior seeks impeccability in his own eyes and calls that humbleness.
New nocks DO make a difference...
I guess with new nocks the arrows leave the string at the same point upon release.
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The other times you've accused me of that I've actually left the computer and went and done something productive, hard as that is to imagine! 
