Re: Tac 15 already paper tuned?
I not only did most of the field testing work and was heavily involved in the development work of the Drop Down Rest that Len was referring to, but I've also written a great many of the step-by-step tuning articles on the TAC crossbows, so like Len, I'm somewhat qualified to answer your question.
Len had it correct in the fact that PSE does not Paper Tune any of their crossbows prior to shipment.
That's not to say that you can't get one that just happens to be correctly aligned and therefore it just happens to shoot nice bullet holes when tested on a Paper Tuner, but by no means should you trust that it will. Before you even think of going anywhere near a Paper Tuner, take the time to Level and Square everything properly, then insure all screws are securely tightened everywhere on the crossbow.
After all accessories have been mounted and secured, then head for the paper tuning exercise. Follow the manufacturers instructions carefully and do not by-pass these instructions if you want a TAC Crossbow that performs well.