Lyman shows one for their sizer luber, Lee would likely make one custom for you at whatever size you want.
You could even take and have the Lee 0.401 bored to open it up yourself.

Any way to use the lyman style with conventional press?

Not really, it would be easier to take wooden dowel and emery cloth and modify a Lee 0.401" sizer to a larger size.
If you have a heavy duty type Cast Iron press you might be able to shove them through the 0.401' die if it has good leverage.

I wouldn't attempt that with an aluminum or die cast press... 

I have done crazy stupid things to my RCBS Rock Chucker.

Like sizing a 40 S&W case down to .401 in a single "pass".  To do this I would have to set the sizing die high, and "walk it down" so I was using the maximum leverage.

Quote from: PointBlank82 on September 20 2016 05:31:48 AM MDT
The threads I saw said it could be done either way. I looked for a die for .406 but couldn't find one. Can anyone recommend? Looks like they make molds in that size.

I am the one that started the .41 cal bullet thread. I bought a standard Lee .401 die, and then sanded it out to .406.



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