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My new cc johnson rifle in 22-3000 r2,  kinda neat now I need dies.
Charlie

Charlie,
After what 40_Rod has said, a Chamber cast is your next thing to try. A small bar of Cerrosafe is your next buy. Try Brownells, they usually have it in stock. Just Google the Brownell name and you should get their website without any problem.

Harry

Cheatin_charlie, I once bought a CC Johnson 22-3000
on a Sharps Borchardt. The original barrel was used and relined. On close inspection I could see .45 Caliber rifling at the Muzzle. Could it have a good Bore? So I disassembled it and heated it up on a stove. When I saw the Solder bleeding I took it down the celler and drove the liner out. Bah! it was smooth. On close examination I found it still showed rifling. One liner inside another, reheated it and drove that one out. Ran brush thru the Bore and it had bright, shiny, sharp rifling. Ended up restoring it. BUT, one thing I had to do was sleeve the chamber as Johnson had reamed it out to create a large head on the sleeves for strength in the mild steel Sharps barrel. Sleeved the chamber back to 45-70 and shot it quite succesfully for many years. Still have it to this day as it was my first really good Single Shot. So the diameter difference is most likely a large chamber slug.
HTH, Regards. FITZ.

Nice Rifle Charlie and it is clearly stamped R2 so you might not need to do the chamber cast.

JLouis

Charlie
My sincere apologies for the wind-up. I only looked at the first photo I see in another photo a second stamp that clearly shows the R2 designation. Oh well at least you learned a little about the cartridges history.

40 Rod

desert-dude, one of the functions of Cerro Bend that I like is that it is not messy, and if you should get it somewhere in the action that locks it up you can melt it out with a hair dryer. Only needs 158 Deg. F to melt. Aaaand, afterwards you can throw it in a bag or box and reuse it as many times as you wish. It is also more accurate in reproducing the cavity you cast it into. It does initially shrink but if you give it an overnight it goes thru a series of shrink and swell cycles and ends as an accurate reproduction of the cavity. I used it for many years to evaluate precision Lens cavity shapes. HTH Regards, FITZ.

chuckster, you are right Cerro safe is the same as Cerro Bend. There are at least a half a dozen materials listed that have the same characteristics. Low melt temperature, 158 Deg F and easy removal from cavity due to initial shrinkage. But with time they all cycle thru a number of shrink and swell cycles and end up right at whatever the part was cast into. Regards, FITZ.

We used to use burning sulphur to fumigate the chickenhouse.  The sulfur dioxide killed all of the mites and ticks and anybody else.  My advice is dont.  Us poor boys in Texas use wheelweights instead of Cerrosafe.  Same proceedure, measure 20-30 minutes after pouring.  Almost as accurate as Cerrosafe and tells you what you need to know and you can afford to keep the casting for future reference.
James