Recently I had a chance to shoot a Ruger #1 in .416 Rigby but only shot 3 rounds as the box cost about $105.00
Those 3 shots did make a cloverleaf at 50 yds. with open sights so there was not any reason to shoot any more.
Good thing about Hornady loading a caliber is that the components become available and this really helps on the cost of brass in the larger rounds. Dave