9mm chamber / barrel question?

[railroader]

Start with what Dubious_Beans stated about the overall length. Just making your rounds shorter might just be the ticket. I have to run bear creek round nose 125s really short in my cz75 for them to work because of the bullet profile. If you decide to go with the factory crimp die you could even just get a cheap single stage press just for the one die if you don't want to upgrade your dillon. You will figure it out. Mark

Cheap press, http://www.midwayusa.com/viewProduct...ductTabReviews

[eaglemike]

If you want to use the Lee Carbide factory crimp die you can install it in place of the taper crimp die in your 550. You will likely need to put the locking nut on the bottom of the tool head, no big deal, many people have done this.
all the best,
Mike

[randy]

If the cases are correct, the chamber should be reamed with a chamber reamer and checked for proper head space. This problem is not uncommon.

+1 here is your winner. If your loads fit in your go no go gauge and other pistols, then ream the chamber.

[J-cat]

Go and no-go gauges do not accept cases. They are plugs that go inside a chamber to measure headspace. His is not a headspace (length) issue, but a chamber width issue.

[J-cat]

Start with what Dubious_Beans stated about the overall length. Just making your rounds shorter might just be the ticket. I have to run bear creek round nose 125s really short in my cz75 for them to work because of the bullet profile. If you decide to go with the factory crimp die you could even just get a cheap single stage press just for the one die if you don't want to upgrade your dillon. You will figure it out. Mark

Cheap press, http://www.midwayusa.com/viewProduct...ductTabReviews

Being his reloads are sticking in his Dillon chamber check gauge, I doubt his OAL is the problem.

[Sailormilan2]

I know that on straight walled pistol cases, Dillon opens the sizer die a bit to allow easier feeding during rapid reloading. This case belling often causes problems if the base of the case is swollen due to an over sized chamber.
However, the 9mm case is a tapered cases and does not need the belling. Still, you might have an slightly oversized sizer die. That coupled with a tight chamber could be causing your problems.
Is there a chance you can borrow another brand of sizer die and try a few reloads with that and see how it goes?

[railroader]

Being his reloads are sticking in his Dillon chamber check gauge, I doubt his OAL is the problem.

I just said this because it's just one thing to check before he starts buying things. If his reloads are sticking in the chamber check gauges then he probably could use the lee factory crimp die that resizes the cases on the finished ammo. Mark