40-65: Learning what I can

[SgtDog0311]

Thanks Kurt. Measurements or no that's a nice reference to have.

Questions:
What is the transition angle on the bottom 40-65?
And is it accurate to say the freebore, when present, is the same as diameter as the groove diameter?

I was thinking the freebore was intended to give just a little room for an oversized bullet but now I'm wondering if that is correct. In effect that would mean two transitions (i.e., a second step from freebore to groove diameter) and I don't see that.

I ask that second question with my Ballard at John Taylor's in mind. The Win diagram shows a .4085 freebore and I believe the TJ liner is a .400 bore and .408 groove so the Winchester Reamer looks like a good fit that could be throated the way I want. I could opt to leave a smidgen of freebore or take the angle right to the start of the leade ramp. That's what I'm leaning towards right now.