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Gunsmithing Stupid Proof question

Sil17sd

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Nov 5, 2017
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Florida
I just bought a Proof tl3 prefit and I dont wanna screw it up in my viper vise..

Normally i leave the scope on and clamp the barrels 6-7" forward of the shoulder. Is this a no-no on proof cf barrel?

Thanks in advance, Scott