we've just had a xmas comp at the club.anyway when it was over a few of us stayed behind and started 100yd target shooting.obviously our scopes fully adjusted we could not see exactly where the pellets were hitting as they were outside our field of view.although we could clearly hear them hitting the wooden back stop.we shimmed up the back of the scopes using aluminium foil taking care not to overtighten mounts as this can easily compress scope and damage it,as the scope will be cockeyed in relation to the mounts.it wasn't long before we were all hitting the targets with groupings of about 6 inches.the pcps were consistantly more accurate but some of the springers did very well.we took some balloons down to use as targets and we popped a few of them but we all fell about laughing when one of the lads hit a balloon and you could see the pellet bounce off(through spotting scope) and balloon intact.one thing was concluded any air rifle shooting up to 12ftlb should not be used for hunting at this range.