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How will they ever know you used 3f?
The only difference in 2f and 3f is granule size. So you are using more "weight" when you use the 3f. If you weighed charges, there should be no difference because it is exactly the same stuff! I would definitely use less volume and 10% less would be a good starting point.
I use 85 gr of 3f and a 460 gr bullshop in several of my rifles (don't own a CVA)
The only difference in 2f and 3f is granule size. So you are using more "weight" when you use the 3f. If you weighed charges, there should be no difference because it is exactly the same stuff! I would definitely use less volume and 10% less would be a good starting point.
I use 85 gr of 3f and a 460 gr bullshop in several of my rifles (don't own a CVA)