Here's the new .257" at 65gr. The BC will be about .150 to .175 - about the same as a 35gr. .224 Hornady Vmax, or the 17gr. .172 Vax.

Probably make a nice light bullet for shooting bunnies and grouse with a .25/20 Win. M92, or Marlin 94 - or maybe the wildcat .25 Hornet in a bolt or single shot rifle.