I have always been impressed with the accuracy of the M1917s. I can't remember what results I had with the No.3 / P14 rifle. The Lee Enfields seem to shoot quite well if fed reasonable ammunition. The Two piece stock isn't all that hard to deal with as long as you aren't trying to glass bed the thing.
What do you mean by "Teflon wrapped" I can't see how that would stay in place when firing.
Attached are some photographs of a No.4 bolt assembly.
1311 Shows the bolt assembly with bolt head lined up and ready to fit into the rifle.
1313 Shows how much the bolt head rotates past alignment with the top / right lug.
1314 Shows the bolt head aligned but backed off one rotation.
1315 Shows the bolt head unscrewed so the threads are visible.
As you can see, putting a shim between the bolt head and bolt body doesn't make sense because the threads control the longitudinal alignment. Since the bolt head rotates past alignment with the bolt lug, the shoulder of the bolt head and bolt body do not contact when everything is aligned. Backing off one full rotation won't help because if your gun has THAT much excess headspace, it has more serious issues. Also, backing off one thread drastically changes the firing pin portrusion.
- Ivan.
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