Reloading 9mm.

To expand a little, no pun intended, when fired your cases expand to the size of the guns chamber. There's a little spring back but it's not noticeable to the eye. After all the case had to release the bullet, right?

So now the sizing die needs to squeeze the case down to the SAMI standards so it fits into a minimum sized chamber.

Now you bell the mouth of the case so you can start the bullet without shaving lead or having it fall off.

After the bullets been seated, the crimp die removes the mouth bell and you're good to go.

Just a couple tips:

be sure to pay attention to walkalongs mention of the 9 being a tapered case. It take more effort to sesize a 9mm case than a 40. A little spray case lube makes life easier on a progressive.

Also, some 9mm cases have crimped primer pockets, and there are even some berdan primed cases floating around. Those 2 things can case problems that you won't find on a 40 as well.

I have to ask, have you read a reloading book yet? It just sounds to me like you have jumped into reloading without reading up on the mechanics.

It would be a good idea to slow down read some books.

Must not skip the resizing step.

greyling22 said:

Just a couple tips:

be sure to pay attention to walkalongs mention of the 9 being a tapered case. It take more effort to sesize a 9mm case than a 40. A little spray case lube makes life easier on a progressive.

Also, some 9mm cases have crimped primer pockets, and there are even some berdan primed cases floating around. Those 2 things can case problems that you won't find on a 40 as well.

Click to expand...

Good points. I always use a little Hornady OneShot on my clean cases. Doesn't hurt anything and the press runs smooth.

I'll admit to breaking a few decapping pins learning about Berdan primers.

Its doubtful, but the die body could need replacing. Lee had to replace my 380 sizing die body. It was my first go round too, freaked me out, thought I was doing something wrong til I figured it out.

I too have noticed that 9mm bullets will fall right in to an unsized case. It is completely normal. I havent played around with components like that with other calibers, but I would expect the same result. There is a reason we need to resize before loading.