The Ordnance Officer over on the CAS City/GAF forum approved my use of the .45-70 Sharps and my choice of a pair of single action percussion or cartridge/cartridge conversion cylinder single action six shooters, even though the Rangers were likely equipped with .50-70 Sharps carbines...close enough.
I think I am gonna like GAF competition, as it is single shot main battle rifle as the emphasis, with less emphasis on the revolver...basically a two gun (rifle and revolver, no lever action repeaters allowed), skirmish, advance, engage, move game...reloading from whatever you have on you, on the clock as needed to engage targets on the clock until are hit...no misses or skipped targets. It is not a super speed game with highly "race" tuned lever guns, saa's. and shotguns, but there are long range side stages.
They periodically have GAF type events down my way at Plum Creek near Lockhart, but the big events are the Departmental GAF and annual GAF musters out of state, since there is no GAF Department of Texas group as I can determine. I will likely be assigned to the Department of Missouri.
The annual muster in 2016 is slated to be a shoot based on the the Battle of the Little Big Horn (140th anniversary). The primary shooting stages will be based on the fight at "Renos Hill" and "Water Carrier's Ravine", plus a long distance event, likely based on the actions of one of the Sargeants (John Ryan) in Co. M under Reno's command. Ryan happened to be carrying his own personnel Sharps on the campaign, despite Custer's orders to travel light with a relatively small amount of cartridges per trooper on their person with the pack train carrying the bulk of their ammo and provisions. The sargeant broke up a group of of Cheyenne and Sioux warriors sniping at him and his men using his Sharps. He also testified that he buried Custer on Custer Hill. He resigned from the army before the end of 1876.