Although my Omega is a .50 cal, Hornady 250gr. SST, 95 gr. BH209 and CCI 209s; you also have to realize most rifles are individuals, as are their load preferences.
As for "load data" for the .45s most companies market them as the same, i.e. almost all .45 and .50 cal muzzleloaders these days (black powder or substitute, of course) will shoot a 150 gr. of pyrodex/777 etc. BH209 will hit those velocities with 120 gr. of powder, I also believe that is what they have listed on their bottle as max.
My next muzzleloader will be a .45, and I've been sold on BH209 for about 3 years now. Honestly, 300 yds. (with practice) is not impossible. We have practiced @ that range, and last year I witnessed my buddy shoot a coyote @ 326 yds. (same load, etc.).
Pick a load you want to try, try it, tweak it and enjoy!
P.S. With BH209, you might have to keep the powder charge slightly lower to keep from pushing the all-lead Dead Centers too fast.