A few days ago I asked if a 1:12" twist would stabilize these projectiles. Colodog generously sent some to me to test which I did Friday morning. Nosler indicated that CFE223 was their most accurate powder so I loaded from their start to maximum loads. The lighter loads produced patterns while the 26 grain max. load did produce somewhat of a group @ 1.8" but, all loads showed signs of tipping at 100 yards. I guess 60 grains is the heaviest this barrel will shoot. Thanks to colodog I have the answer! 
Shew me thy ways, O LORD: teach me thy paths.
"there are few better cartridges on Earth than the 7 x 57mm Mauser"
"the .30 Springfield is light, accurate, penetrating, and has surprising stopping power"
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