Alex Wheeler
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If I understand you, your fitting the threads tight? Are you re cutting the threads in the bolt single point? I also have have oversized steel shrouds for remington style bolts but I do not fit the threads tight. I have definitely seen shroud fit improve a rifle in Benchrest. Tight only works if everything is straight in my experience.My oversized shrouds were fit the same way via bearing surface and thread fit, i just used more threads. Same difference, threads were fit and shoulder was turned to fit into back of bolt. Juice isn't worth the squeeze IMO.
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