Think I figured it out. Beautiful engineering.
Two different thread pitches on the collar. Coarser pitch on the action adapter. Finer on the barrel.
Tightening the collar would pull the barrel in. Loosening would push it out.
Great design and wonderful machining.
Chuck

Chuckster wrote on May 23^rd, 2017 at 11:35am:


Yes, you hit it Chuck! Not only different pitches, but also different diameters on the barrel and receiver bushing too. A small void between the two threads in the collar to separate the different diameter and pitch of the halves.
It doesn't fall apart when loosened, but slides quite easily. The Pope book mentions that Claude Roderick didn't know how the system worked when sent info on the gun to him in a letter in 1974.

marlinguy wrote on May 23^rd, 2017 at 11:42am:


A few times before, we have discussed the income level required to play our game back in the day when our Schuetzens were still with their original owners.  Those guys were well off.  If not today's 1 % then certainly well above 10 %.   

I don't think an ordinary working barber could afford to play that game.  I hinted at that when I wrote "additional sources of income".  That was before Prohibition and back when drugs (opium, cocaine, marijuana) were legal, maybe even sold at the corner pharmacy.  What remains seems to be  gambling & prostitution.  A barber with a gift of gab could easily run such operations out of a hotel.   

Of course, maybe he just listened to what his customers said and played the stock market.

Vall, how much does the whole cased set weigh?  I am curious about the strength of the latches.  Does it have handles?

And now that you might have some suspicions about Mr. Pridy, will you give the rifle a name?  Were it mine, I would call it "The Happy Hooker".

Pinwheel wrote on May 23^rd, 2017 at 4:10pm:


Thanks Russ! But the .28-30 in this gun is an oddball. The gun came with a chamber cast, and this .28-30 is based on the .25-35 necked out to .28 caliber! The book on Hartford Pope rifles states this is the only known Pope barrel chambered for this cartridge that is known. So going to have to likely take some .25-35 and expand necks to .28 and see how they fit.
Good to chat with you at Denver! It was fun!

oodmoff wrote on May 25^th, 2017 at 3:08pm:


Thanks Darin! Sure wish you could have made it also! We had fun at the show, and at dinner Friday night too! Not sure what to think about my good fortune? I was so fortunate last year with the Schoyen Ballard cased rifle. Then finding this Pope the next year seems nuts. But I'll take whatever others pass by anytime!

That is interesting. Would have guessed it was later.
Think the barrel moves by the difference in thread pitch.
Have only seen the technique used on ultra-precision adjustment devices. 
Chuck

Vall,
I'm late to this thread!

Now, your going to make me go to your OAC gun show again, just to see it

Frank

Chuckster wrote on May 30^th, 2017 at 11:55am:


If I was guessing, I'd say the barrel was threaded to accept the threaded piece. So internally and externally threaded to secure it. Same as the piece on  the receiver that is externally threaded to match Ballard receiver threads, and then also threaded to accept the locking collar.
Page 494-495 of the Hartford Pope books shows the patent, and patent drawing in great detail. But no notes stating anything else about Pope's design. Seems a shame they didn't address the patent, but maybe because nobody ever examined this system. 
I looked at Terry Buffum's before it went to Amoskeag, but never took it down to know what it looked like internally. I would hope there might be others beyond these two Pope rifles that utilize the takedown system!