WHat would the appropriate adjustment for a primitive sniper score on a crossbow be. This is assuming that it utilizes maybe two crystals that magnify the range. Would making the effective range of the crossbow +1/50 yards be a good adjustment? Basically im wondering how you would handle a sniper with a "sniper rifle (weapon)" and possibly a scope.

Heh. Check this thread:
http://www.indie-rpgs.com/viewtopic.php?t=3463&postdays=0&postorder=asc&start=0
Towards the end it's almost only about scopes.