I have some really basic questions that didn't seem to be addressed elsewhere in the forum. I'm new to crossbows but have some experience setting up compund bows. Because the nock point is "fixed" on my TAC15i, am I correct in assuming that all paper tuning adjustments are done with the rest? Years ago I used a 6 Ft compressed bale of styrofoam (rejects from the local solo cup factrory) as a back stop during paper tuning. I no longer have the bale and don't have access to an indoor range. Can I paper tune using a low frame in front of a "block" type target from the prone position using a bi pod? Any suggestions for a better set up as a back stop? Thanks for any advice.