I used Din's 30-40 chamber reamer for my build.
It was a very well used chamber reamer and had obviously cut a lot of chambers and been sharpened a few times because it cut a way under sized outer shoulder and neck.
And it was not a great looking chamber straight off the tool.
But a number of hours honing and polishing the chamber to fit fired brass from my other 30-40 sized through my dies and I have a very nice chamber sized exactly to my dies.
So my precious genuine head stamped 30-40 brass will only be lightly worked during re sizing
And this is maybe contributing to the accuracy.
But I will give most of the credit to the Vulcan barrel
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