I use an odd NEI bullet mold, casts .272 diameter bullets and I size them to fit my rifles which have oversize groove diameters.
I have used Unique, Green Dot and H4895 and obtained very close grouping at 25 meters, and thus for some time I used them for shooting grouse while elk and deer hunting. Hundred yard 3-shot groups were good, under 2 inches, some hovering closer to and inch on occaision on very still days.
Remember, in order to fit the bullet to the barrel, you MIGHT find you have a groove depth that exceeds the allowable bullet diameter because of tight chamber case neck tolerance. For example, if you have an .370 groove depth you might want to shoot .371 diameter bullets, but beware!!! Some 9.3x57 chambers will not allow proper release of such bullets. Check your case neck release first. Try a sized, lubed bullet in a fired case mouth. It should slide in easily. If it doesn't, you cannot use that bullet diameter or you will risk excessive pressures.
Last edited by 9.3x57; 08-28-2010 at 08:54 AM.
Formerly LeeSpeed; I believe in God the Father Almighty, maker of heaven and earth...and in Jesus Christ, His only Son, who was conceived by the Holy Spirit, born of the Virgin Mary...I believe in the Holy Spirit...the forgiveness of sins, the resurrection of the body, and the life everlasting.