My TC Hawken .45 shoots well at 100yds with 70gn of Kranks medium with a maximum load of 110. I use 20gn of fine or medium at twenty five yards to stay within the range maximums and find it very accurate. If yours has a one in 18 twist like mine for round ball you'll probably find 200gn REAL bullets work well but the 250gn don't stabilise as well and the group opens out. They really are great fun.
By the way flickr has posted your entire library of pics.