A couple of question for everyone.

Can you identify this wildcat cartridge for me?

Barrel is marked with .30
Barrel has 0.300” bore/0.3085” groove diameters.
Chamber specifications are as follows:
• Diameter at bolt face/chamber junction: 0.53326”
• Diameter at shoulder: 0.51309”
• Diameter at shoulder/neck junction: 0.34000”
• Diameter at neck/mouth junction: 0.34000”
• Length from bolt face to shoulder: 2.00500”
• Length from bolt face to shoulder/neck junction: 2.20497”
• Length from bolt face to neck/mouth junction: 2.53200”

Also, can you identify what current brass would be best for use in forming cartridges?

Thanks,

Dimensions are very close to the .30 Newton. You won't find many cases with those dimensions so I'd say 30 Newton brass is what you'd need. I'd also venture a guess that it's not a wildcat but a 30 Newton.

Ray

What is the history of this rifle, about when made, and are you measuring a chamber cast of cerosafe for those specs?

Could be a misbegotten 30/375 Ruger cat if it is recent, and possibly done by Ray Atkinson.

quote:

Originally posted by Cheechako:
Dimensions are very close to the .30 Newton. You won't find many cases with those dimensions so I'd say 30 Newton brass is what you'd need. I'd also venture a guess that it's not a wildcat but a 30 Newton.

Ray

Ray you are correct.

quote:

Originally posted by RIP:
What is the history of this rifle, about when made, and are you measuring a chamber cast of cerosafe for those specs?

Could be a misbegotten 30/375 Ruger cat if it is recent, and possibly done by Ray Atkins.

Ha ha Rip. Ray had nothing to do with it.

We all know that Newton standardized on two diameter measurements for the .30 Newton and derivative cartridges chamber dimensions; that being .531” diameter at .147” from the bolt fact and .503” diameter at the shoulder. The other dimensions varied for each cartridge, bolt face to shoulder length, bolt face to shoulder/neck junction length, and bolt face to mouth.

There exists a Newton Arms Co. Inc. draftsman’ drawing of the .30 Newton cartridge case, dated 10-6-1916, that specifies a .508” shoulder diameter. An image is contained on page 166 of “The Newton Rifle” by Lawrence Wales ©2008.

So I took the .30 Newton’ chamber dimensional data from the 1919 catalogue and fed the data into the QuickDESIGN program using inch measurements and the CIP design specification. QD identified the following:
R1: max cartridge head as .531”/min chamber head as .5332”
P2: max cartridge body as .5015”/min powder chamber as .503”

I then used the QD .30 Newton data to generate the .30 Newton Improved cartridge using CIP design specification. QD identified the following:
R1: max cartridge head as .531”/min chamber head as .5332”
P2: max cartridge body as .508”/min powder chamber as .5101”

I fudged slightly on the shoulder diameter slightly just to see if anyone could identify the cartridge, even if they’ve read Larry’s book.

Sorry for the misleading info…. And Ray you are good!

Correction in data