ORIGINAL: Hotburn76
I will try to answer your question, but having a hard time reading your print!
Try not to pick a smaller print size, some guys are going to have a hard time reading your post.
I may have missed it, but what CB are you shooting? Nock has to do with the claw release for most CB's. A upper release claw needs to have flat nocks, lower release can do both on most CB's. The other factor is rail style. Horton is the only one I know of that does this, but that have a deeper cut arrow groove in the rail. then the end of rail is normal. This acts like a rest set up and if you use flat nocks on this style you will have problems. Most all of the newer Horton's are like this I think.
Here's the deal on nocks, to expound on Jasons explanation. If your claws swing up above rail, the bow takesflat nocks as physics make the string slide down onto the rail. Youcan use the half moon style w/ this type bow, but the consensus of opinion seems to be that flat nocks will give a little better accuracy. If the claws flip down into the rail, the string tends to want to rise some and those type bows usually call for half moon nocks to insure you don't have a partial or total dry fire. There are some exceptions to this rule of thumb, and there are people who disregard this and have for ever, their call, lol.