40/82

[Hiwall55]

Anyone have any experience with the 40/82 silhouette ,Rhoades or Crossno. Going to have one 40/65 reamed out to one or the other. Crossno has a longer neck, might be good for some longer band bullets.
Called about 10 people to rebore my 40 caliber barrel , no one had time to do it so I'll wait and see on that

[Don McDowell]

I know a fella that has a CPA that started out life as a 40-70, somewhere it got turned into a 40-82 (crossbow I think) Anyway it wasn't doing much of anything, and then he got ahold of some of the captec 40-82 brass and it's shooting well for him now. He's shooting a big ol creed moor bullet with a couple of bands exposed and Olde Eysnford powder.
I still got the hots to find a Shiloh Hartford in 40-65 and have it reamed to 40-70 bn.

[Kurt]

Both chambers are based on the .45-2.4 cases but there is a difference between the Rhoades and the Crossno .40-82 chambers. The Rhoades has a .400" cylinder ahead of the rim on the base tapered 1.02 degrees to the cylinder neck then .400" to the chamber end.
The Crossno is tapered from the rim to the case mouth length of a .40-65 then a cylinder to the chamber end giving it a longer case neck.
To change the .40-65 to a .40-82 Crossno can be easily done with a throating reamer only. You can even do this using a T handle without removing the barrel from the action with a reamer like this.

You can use this reamer to change a .40-70 Sharps to a longer .40-3.25. I used this reamer for a .40-65 rifle I have that had a bad factory throat and made it a .40-72 to clean up the chamber.
Kurt

[Hiwall55]

My trouble is that the base of the case is too fat to chamber even with my RCBS Shiloh Sharps die set, only about 1/3 of the cases will fit. I did a chamber cast and it was undersize right above the rim. Plus with Remington brass the neck was too tight-.011 ,Winchester and Starline at .010 shot Good

[Kurt]

What is the diameter above the rim?

[Don McDowell]

I've got the same problem, with brass that was fired in the roller or the CPA , there's no way to get the case head sized down enough to fit the C Sharps 40-65 chamber.

[Kurt]

I had a wide base shooting the .45-90 cases in my Shiloh for several years made the base at .504". Shiloh normally uses a .505" base diameter so I made a base swage die to take the base down to .499"
My tight PP .45-90 I made the reamer with a .502" base to match the Starline brass closer which runs close to .500". This keeps the base ahead of the rim about .060" stretching the web from expanding larger.

Don I can see why your brass shot in the CPA .45-90 wont fit. When I build my CPA .45-90 I had a reamer made because I did not want that large base diameter they use at .5084" for the first .100" then going to .5072" plus the large .481" case mouth.

[Hiwall55]

The first 100 cases were Remington and all fit but 6, but the neck was too tight, so I tried NOS Winchester that I had hoarded , out of 100 case got 50 that would fit, then brand new Starline 40/65 and got 100 to fit out of 150 cases.
It has been a pain, I have a couple Hiwalls in40/65 so I'm looking for some other chamber

[Don McDowell]

The 40-65's are the problem.
The CPA 45-90 chamber is somewhat larger in the case head than the reamer we used to chamber the bpcr rebarrel is a touch smaller in the case head, but full length resizing allows the use of the Captec brass, and happily both chambers will shoot paper patch very well.