sizing issue-Jaming on feeding

[digger2]

My lee 9mm says it should be .356.
My gauge(digital calipers) says .3574 and I keep getting feeding issues and jams.
The Lyman book says a 9mm should be .355

Is this enough to cause a jam or is there something else in play?
I use a 4 die lee carbide set.

[thai562]

It shouldn't be jamming. Make sure you push the case up far enough into the bullet seating die to start crimping the case lip.

[noylj]

I have never seen a 9x19 that had any problem feeding bullets up to 0.359".
If it won't feed, take out the barrel, coat the bullet and the first 1/2 of the case with black magic marker, drop in chamber and rotate back-and-forth one or two times, remove the round and SEE where the problem is.
If marks are on bullet, the COL is too long.
If the marks are on the case mouth, you haven't removed enough case mouth flare.
If marks are down where the base of the bullet is, you didn't expand the case ID enough (not talking case mouth flare/bell, but the actual case expansion where case ID should be 0.001-0.002" less than bullet OD.
Fix the problem and then recheck.
A 9mm jacketed bullet should be 0.355-0.356". A lead bullet should be at least 0.001" larger than barrel groove diameter (which can range from about 0.354-0.362" in various 9x19 barrels.

['ol shooter]

I taper crimp mine until they drop freely into my case gauge, and they feed like clockwork. I have never had a fail to feed on 9mm or 45acp. I don't measure them, that's what the gauge is for. Just my $.02.

[J-cat]

I think he's talking about the bullet diameter, not the case.

9mm bullet diameter depends on your particular chamber dimensions. I run .359" bullets all the time. Some chambers are a bit tighter and need .358". Bar-Sto told me theirs have .357" throats so you 'd need .356".

Of you run an undersized bullet you'll get leading even if the bulletbis a good match for the barrel. The chamber throat dictates the size, just like in a revolver.

[Sheldon]

What pistol you shooting the rounds out of and more importantly, what powder and charge are you using? Need more details......

[digger2]

It is happening on both sig p226 and P6
I am using 4 grains of Winchester WSF.
I have ordered a case gauge as suggested as well.

[J-cat]

Field strip the pistol. Remove the barrel.

Do they drop in and out of the chamber without binding?

[digger2]

just what I started to do

[digger2]

They drop in ok, but I think they are not fully seating

[J-cat]

What bullet? What OAL? I think the bullet is hitting the rifling.

[digger2]

cast bullet.
lee 356-120gr Tc
measures .5635 long and a commercial one I have measures .5535

[J-cat]

Ok, but to what overall length did you load it?

1.169"?

[J-cat]

Here:

http://castboolits.gunloads.com/showthread.php?115157-9MM-OAL-for-356-120-TC

Your OAL should be in the 1.050" range, else the boolit will hit the rifling prematurely causing FTF malfunctions.

[digger2]

1.10-1.08 av
the max was 1.12

Lyman book says a max of 1.169