Melt some sulfur and make a chamber cast.  It will tell you exactly what you need to know. Sulfur is easier, cheaper to use, and gives more reliable information.

CHRIS

Two pics I asked about months back and really did get an answer.  30 cal.

Opps..Did not get an answer...Is this  A 30 Schwartz  ?

Yes. I bought a miller barreled action and this barrel was on it. I always take a chamber cast of anything i buy just to be sure.  Probably will build another 32 miller short...thankyou for any help ! Pete

1.260  base to shoulder
.330 neck dia  from casting

My .30 Schwartz, at least I believe it’s a .30 Schwartz, doesn’t have a shoulder as shown in the pictures above. It’s a straight, full-length taper (see picture). The brass I have measures from 1.98” to 2.00” long. The seaters are just over 2.00” long.

The reason I asked for the chamber or brass dimensions for the .30 Schwartz is because I have some brass that fits the chamber of the gun, and some that don’t So, I’m curious what the dimensions are supposed to be vs. the brass I have.

I have a piece of brass that came with the gun that fits. I also have a breech seater that came with the gun, and the brass doesn’t fit in the chamber. I’m pretty sure the breech seater belongs to this gun because the seater handle matches the wood on the gun. I was surprised it doesn’t fit??

My friend just happened to have some .30 Schwartz brass. His brass doesn’t fit my gun either. Unfortunately, he doesn’t have a gun chambered for the .30 Schwartz so we can’t compare chambers.

Anyway, if someone does have dimensions for the .30 Schwartz chamber or brass, I’d still like to get them if you have them.

I do not remember the exact source, so you get what you pay for.

The 30 Schwartz cartridges are shortened versions of the 32-40. I don’t know if there was actually a dedicated reamer and that’s why chambers vary.

To chamber a barrel a 32-40 reamer was ran in until the .380” diameter was cut, 1.600” deep for the short version, 357 maximum. 421” for the long at 2.00” deep, 30-30.

The problem this created is forming the brass. It is a straight taper to the rim, no .200” long web. Using a 32-40 die cut to the appropriate length, you use a flat base adapter in the shell holder or an arbor press so you can push the case all the way in until the rim contacts. Then you have to push or drive the case out through the hole fore the expander. I have formed both versions this way.

Depending on bullet diameter and brass thickness, or if you are shooting fixed ammo or breech seated, you may need to size down the neck. A 32 S&W die will work for that.

This might have been described in the book that was co authored by Wayne Schwartz and Charlie Dell, “The Modern Schuetzen Rifle”. I don’t remember where I read it. Possibly on this forum.

The basic cartridge dimensions, and a couple loads are in the appendix of that book.

Hope that helps.

Skalkaho wrote on Oct 19^th, 2025 at 3:14pm:

Let me know the shoulder diameter and I might be able to come
Closer in ID maybe form some brass close enough to fire form.

What are the threads? 
I might be interested if the tenon can be rethreaded.

QB15, I'm surprised you haven't gotten an answer to your question yet. I know there are guys shooting and making .30 Schwartz as I see them listed in the match scores. Hang tight, someone will eventually get you the information.

On a separate note, and I don't mean to piss anyone off, but the OP wanted info on .30 Schwartz and all of a sudden, other questions are being asked about other brass and it's hard to follow who is answering which questions. Can we please show a little curtesy to the OP (any OP) and keep the replies to the topic under discussion/ question asked?

Thanks again Dellet, I appreciate the dimension and load info!!  I will also contact JGS about the reamer print.

I’ve been hesitant in doing a chamber cast because I really don’t want to take the gun apart but the sooner I get that done the better… 

Someone, somewhere must have made one as I was loaned the designers reamer. Sorry I don't recall the reamer makers name. Quite possible the designer Mr. Schwartz made it. You might try calling other reamer makers.

Had a mod j in 30 Schwartz long ago!
Case was a 30-30
Ch4d had a sizer die, 
Do not remember any numbers. 
My rifle was chambered by doc brewer using Schwartz’s reamer.
Shot very well

Neither  Pacific tool or Manson Reamers have any 30 Schwartz...A tough one......