a factory loaded round should be able to fit into a new clean Full length die, right?

No. The die should size the neck to a diameter smaller than the bullet so the bullet is held firmly. When the bullet is seated, it will expand the neck a little, making it too large to fit into the die.

i mean an unfired loaded round?

Yes, I also mean a loaded round. The die is designed to reduce the neck diameter to less than that of the expander ball. When the case is removed from the die, it is pulled over the expander ball which uniforms it and still leaves it a little less than the diameter of the bullet so the neck will have a firm grip on the bullet. When the bullet is seated, it increases the diameter to the actual diameter of the bullet. You can demonstrate this for yourself by removing the decapping stem with the expander ball and sizing a case. Measure it and the outside diameter of the neck of the fired round. You will see the outside neck diameter of the resized case is definitely smaller than the neck diameter of a loaded round. Hope this makes sense.

Got it. Thanks

Absolutely not; that won't, and can't, work. Loaded rounds are bigger than the sizing die in the neck; otherwise it would not hold the bullet. If you force it in, you will only succeed in doing one of two things:
1: Getting it stuck in the die. Probably irrevocably.
2: Sizing the bullet down to the next smaller caliber. Because it is inside the brass case, neck.
What is the real question; there is always one.

I am curious about the real question as well. No offense but are you not comfortable setting up our sizing die? I don't know how old you are to reloading but when I started in the early 70s I had a lot of questions + at that time not too many folks to answer them (at least correctly).

what Tom said ..

1: a sizer REDUCES NECK diameter to provide neck tension to hold the bullet - not to mention sizing the rest of the case, as you wouldn't likely make it down far enough to interact with the shoulder and body
2: a bullet in the case, even inverted and flush with the mouth, EXPANDS it from nominal
3: there isn't clearance provisions for the bullet to go into the neck - this might not be a real problem in medium bores
4: IF you managed to crush fit the LOADED ROUND (YIKES!!!!) into the die, it will likely get stuck, and then there you are, removing a bomb from a chamber

but, if what you are wanting to set the die to match the factory ammo, there's ways to do that.

( i would NOT use loaded ammo for this)

remove the bullet with a bullet puller, dump the powder in the toilet, and (pick a way) kill the primer .. note, if you are as dumb as ME, you MIGHT consider "firing" the primer.. THIS IS LOUD AND DANGEROUS!! inside the house.. it will result in the wife giving you lectures for DECADES ... or so my friend told me

take a sharpie, and mark up the neck and shoulder..

adjust the die HIGH in the press, take this shell, and adjust the die down until it is just barely scraping the sharpie ink off just AT the shoulder

the seater should be easy .. measure OAL of a factory round, and set the seater to that length, with a little trial and error

just curiosity, i read onthe internet LOL, that it should fit, so i grabbed anew round and tried to slide it in, that's it

Teaches you not to believe anything you read on the internet, except on AR, where you get about an 85% correctness factor.

quote:

Originally posted by blackeyeddueler:
a factory loaded round should be able to fit into a new clean Full length die, right?

Not if it's still loaded.

NO!

your are exactly right

quote:

Originally posted by dpcd:
Teaches you not to believe anything you read on the internet, except on AR, where you get about an 85% correctness factor.

Stop reading stuff on the internet.

Steve........

quote:

Originally posted by blackeyeddueler:
just curiosity, i read onthe internet LOL, that it should fit, so i grabbed anew round and tried to slide it in, that's it

It didn't go all the way in, did it? If you took the decapping pin out and forced the round in, the question could be: how do I get it out?

you drop the entire assembly in the trash bin on your way to the truck to go buy a new size die.

quote:

Originally posted by blackeyeddueler:
a factory loaded round should be able to fit into a new clean Full length die, right?

A loaded round does fit into the full length bullet seating die, maybe that is what was meant on the internet, for whatever value that is to know