L.R., Kind Sir,
Many years ago, the CVR NCOWS POSSE, now defunct, put on Buff Shoots up at the Ackley, Iowa range. The targets that B.T.B. mentions above where used for those events. My Family sponsored a 'Stand' event every year for awhile til the number of Shooters ran out due to work schedules, age, health, etc. The Ramrod of the Buff events at CVR had a full-size Buff target made and it was painted white with a black bullseye. It was the final target in our 2-day event with ranges running from 400 to 1,000 yards, the Shooters moving back after each relay.
At 1,000 yards shooting into the morning sun, uphill, it was always a challenge but they all came through and helped each other spot and josh when hits and misses were made. I even hit the Beast at 1,000 in the butt with my Pedersoli 45-70 and tang sights with handloads, not to shabby for an old Fart! Of course I stopped shooting after hitting it so I wouldn't embarass myself anymore, HAH!
Anyway, a Buff target in realistic colors would make significant challenge to the Shooters and I would encourage you to give it a try as it will make for some 'tall tales' for sure and certain for those that hit it!
Create your own 'Stand' event and have a ton of fun!
Best regards and good shooting!
'Ol Gabe
P.S.
Where is your range located just in case some of us Iowegians, Illini, Minnesnowtans and Wisconsonites might get the urge to attend?