[pilgrim,
Did we ever settle,for sure which chamber you have? If it is 8x57IR(JR) or is it 8x57R/360? Bullet(groove)diameters in the IR,as variable as they are,are usually more consistent than the /360. I would be surprised to find an IR that needed a .313 bullet, but not in the /360. There are several 8.15x46R that I know of with .312-.313 groove dia., and they would use the same or similar barrel as the /360. If you do need .313", then about the best compromise for jacketed bullets would be the .312 bullets intended for .303 British,7.7,7.65, etc. If you need .318, then the above recommended sources are good.The Midway .366 bullets may be for 9.3x62,not 72.
Mike
Last edited by Der Ami; 03/14/13 05:13 PM.
