Originally Posted by
Rich
I think a taper reamer is a better way to go than a twist drill; it would be remarkable if a twist drill was that accurate, as any imperfection in the grind will make it cut oversize.
yup, I have a taper reamer that goes from 2.5-3.5 perfect range. I also have a couple of 3.0 and 3.2 parallel reamers, as it's amazing how often that's where the sweet spot ends up (even allowing for the variation in port length, calibre, piston weight, preload, piston mass, and the phases of the moon 
)
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
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