Boomer,
I dial to the bore and turn a 1" diameter fit so it goes in the collet in my fixture.  I'm not sure what action these will end up on so a 1/2" long is enough to hold.  I used to run with two supports between the head and the tail support. I discovered one is enough.
Greg

So I had this Remington 540 single shot 22 action and a 308 barrel. A little machine work and a stock made it into a 32ACP. For those of you that don't know what a 540 is, it's a bolt action with 6 rear locking lugs. A little overkill for a 22 LR. The bolt is in two pieces so it was not to hard to make the forward portion for a center fire. The chamber was cut with a 32 S&W reamer to the desired depth and everything worked out just fine.

I must admit that this topic really hit home reminding me again that I haven't completed any of the following (rank amateur here - broken screwdrives and a rusty pipe wrench): Ballard Pacific return to shooting,  2 32-40 high walls needing stock work, at least 3 low walls to assemble and/or line .22 barrels, try to convert an AYDT to .22 rimfire and build a trapdoor sporter - something that isn't as punishing as the 45-70. 
Occurred to me that if I sell/trade all of them, I can start over fresh next year.  Happpy New Year!

I'm gaining a little ground on my projects, some barrels getting closer and the second high wall in a brace of them I have plans for - still inletting - plan is to have this shooting with loads worked up by mid month.   

Thanks everyone for sharing, nice to see others are involved.

Greg, That Low Wall looks like it may have come out of a river, like a Ballard I know of!
Bob

Finishing it “as is” will definitely make it a conversation piece.  People are always asking, “what’s wrong with that action” on my gun.
Bob

"as awkward as they look ... shoulder one offhand and they just FIT."

Couldn't agree more, I have two of them and for awful hand they don't come much better.    

When you get your's done, share pics.

Work is still getting in the way but I'm not a complete slacker.  A few late evenings and a little progress has been made.  Here's pics of this Ballard mutt, the barrel with the chamber finally cut (the 30-06 reformed cases are working as well as the originals - that long skinny reamer dealt it's fair share of issues to make)  and the guts of the breech block on display.  The self cocking mechanism may work this time around.

rnnhntr, thanks for sharing a progress report.

I adopted another wayward high wall around christmas time (that's what my son calls it anyway) I provide sanctuary for single shots that otherwise may end up in the scrap bin.  Some Parkenfarker has modified the barrel from octagon to half round  - with a hand grinder and the bore looked like it had been drilled out with a brace and bit for some form of a liner, maybe a Roebuck 22 barrel that Harlan thought he could grind with the same grinder and make fit...  The tang screws were missing but fear not, drywall screws were in place with a dab of steel putty.    More details on this later...
This will finish out as a mate for the Ballard, same caliber only in a bench configuration...
GT