my eyes need a larger black bull size when using apeture sights. a 6 in. black is what used to work for me. now i need a 8 in. black at 100 yds. i have some hoppes brand that have a 8 in bull . the designation is NRA# TQ-4. i would like to get something on a heavy paper and get replacement centers. that being said is there any information as to the size of the bull's on the targets that are available ; i can't find anything.