I set mine up on the right side of the rifle with the left side of the LR about 10” away, alongside the action so I can still reach the operating buttons. I use the LR base (sold separately 😊) to mount it.
i aim using the V notch on top and aim it a point somewhere between 1/2 - 2/3 of the way between the muzzle and the target. I’ve come to favor the “doppler” trigger mode and have been successful with .224 40 grain Ballistic Tips and Blitzkings up to a little under 4000 fps.
About the only time it misses a shot is when I forget to change the velocity range if I’m testing handgun and rifles at the same time or when the batteries are about gone. To conserve batteries, when I’m changing rifles I turn off the LR as I put aside one rifle and set up with another. You can also use a rechargeable battery pack.
