CW,I can say, the first chamber I had cut, Dowling used a 22 PPC reamer held short with a .242 or 243"??? neck. That barrel had a shorter FB and I did polish the inside of the necks..... Tony Boyer style.
As you can see on the attached Walldog reamer print, I have an effective freebore of .0643", that helps keep the bullet out of the "old shoulder area" of the case neck and give a tiny bit more capacity.
With this reamer, I did have to go up in powder a touch to get the accuracy I was looking for, but that is not an issue at all.
CW
Very interesting. Yes my reamer was a very short throat. No way for us to avoid the stepped neck unfortunately. I always wondered how people were getting away with this, and I had the step from hell! Lol. Mystery solved. Nonetheless it is an amazing little cartridge, and was fun to whip up on the 6PPC guys every once in a while! Good times and very fond memories.
Paul









