Load: 30-06 Sprg
165grn Nosler Solid Base Ballistic-tip Boattail
Remington new case only neck sized and chamferred/deburred
Federal #210m Bench Rest primer
H4350 @54.5grn
Cartrige overall length: 3.310"
Rifle: Tikka T3 Light Stainless LH 30-06 Sprg
Target distance 50 meters, about 54.5 yards (wasn't able to go out to 100 meters, about 109 yards, because it was a military base range and it wasn't cleared out to that distance during the weekdays).
My measurement from center left hole to center right hole is 3/16" which would be 3/8" at 100 meters. I know I still have some refining to do as there were problems with some of my other loads, but this is very promising.