Gentlemen,
Here are the results of my first tests with WCC-860 ("virgin" surplus from pat's reloading) using Jword bullets in the 8X57mm.
Test gun is a Yugo M48 Mauser in original configuration.
First load;
Winchester WLR STANDARD primer
48.0grs WCC-860
Remington 185gr SP bullet
Crimped using Lee factory crimp die
Average velocity: 1427 f.p.s.
Extreme spread: 48
Standard deviation: 15.9
Second Load;
Same as above, except used Federal 215 MAGNUM primers
Average velocity: 1441 f.p.s.
Extreme spread: 18
Standard deviation: 5.7
Both loads left approximately 2 grains (weight) of unburned powder in the cases and the bore had unburned powder in it from breach to muzzle. I dry patched the barrel between groups.
Load number 2 gave me a nice 5 shot group of under 1" at 50 yards, along with improved e.s & s.d. If I can get this load to shoot faster and cleaner I'll love it LOL.
My next round of tests (hopefully tomorrow) will feature load #2 duplexed with IMR or H4198.
I'll report results here, as well as add them to my gunloads webspace.
SSB