Hope im not too late.
What I have found to be the best, is not do a sniper-sniper event, unless thats all you have. Any other units/sections going out with you?
For instance, What I do is go to the Scout PL/PS and see where they are operating and mission ect. have them NOT inform the squads of our presence, even though they always do.
I use that as OPFOR intel and plan a real mission around that without giving my guys the actual routes. Let my TL's pick their equipment, routes, FFP ect. From there we go do our thing. I tell them if they can capture someone, its fair game, and the scouts will attempt to detain them as well (even though they dont "know" we are out there). What that does is ensure these guys try their best to get as close as possible w/o being detected.
If you think about it, observe/reporting is the majority of our job, so have the guys focus on doing that. all the basics, and as much detail as possible- nametapes if they can, specific times, time spent in x psotions ect.. all the details we can gather. maybe even give the PL/PS something to give a single guy to have and the snipers look for ect. Have them call it in in real time and track it in their logbooks. and if doing more than 1 excercise, incorporate previous data from their logs books into it to see if they can recall it and know to look back..