Shadow 2 - If I want to keep single action pull about the same, but reduce double action?

[Matt1]

Where do you find 10lb main spring? Does it work with Fiocchi, Sellier & Bellot, Magtech, Murom primers? 

Seboweapons.com

Works fine with S&B and CCI’s


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[xdf3]

How come some shadow2 seem to have a different pull with the exact same springs? Is there any secret?

 

What pull do you have with 10 Lb main spring?