Problem with chamber and reloading

[daxbax]

Hi folks,
I have some problem with an original 45-75 with reloaded brass.

My equipment is:

45-75 Lee precision 3 dies set
WRA CA WCF brass
0.459 diameter Bullet (flat nose but for the question it's does't matter)

When I try to fit the reloaded cartiridge inside the chamber of the gun it does't fit inside the chamber, if I force whith the lever the cartridge goes inside the chamber and when I pull off the cartridge unfired, I see that the chamber operates a resize in the bullet part of the cartridge, it's does't matter for me but I thing the efford in the lever can make some damages ( this is very hard efford).

If I mesure the diameter in that part (the part were the base of the bullet stars until the end of the brass)of the unfired cartridge pulled off by the gun that is resized by the chamber this is 0.481-0.480 so this is the diameter of the chamber in that part.

It's the chamber too smal?
It's the bullet too big (in diameter)?
It's The brass too thick? they are 0.012'' (they are WRA manufactored so I think they are correct)
are the Lee dais set?

If I resize the bullet diameter to 0.454 the problem vanish, but this diameter I think it's too small

As anybody, the same problems?

Thankyou

[Joe Lansing]

    Your problem could be with any of the items you listed, but I'll start with the bullet diameter. It should be  about .457. If you load with black powder, it could be smaller.
    According to "Cartridges of the World" the neck diameter should be .478.

                                                                   J.L.

                                                               

[john boy]

Dax, the only sure way to determine which item is  possibly wrong with the chamber is to make a casting of CerroSafe and start measuring.  Do it within one hour after the cast for the best dimension readings

[rustyrelx]

So shoot some .454's and see what you get. I wouldn't condemn it before you tried it.