Larry, this gets more complicated. The 7.7 barrel stamp is the metric equivalent of .303" (bore diameter), and in Europe the .303 Brit is sometimes called the 7.7 Vickers or Bren. Also, the jacketed bullet diameter of the .303 Brit is .311" to match the groove diameter. A long way from .318" but coincidentally it is a rimmed cartridge. You're definitely on the right track. Get some cerrosafe from Brownell's and cast the chamber before you shoot anything in it, or buy any ammo. Be sure and plug far enough down to cast long enough to get past the throat and into the bore. The cerrosafe comes with instructions.
The 8 x 57 JS is sometimes identified as a 7.92 x 57.
This is a very nice problem to have. Good luck, Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member
A big fast bullet will beat a little fast bullet every time
Last edited by specweldtom; 05-03-2008 at 07:09 PM.