I don't have a SAMMI spec diagram on the 500 Jeffery.

Can anyone tell me what the rim depth is supposed to measure according to the spec's.

I don't quite understand what you mean by "rim depth" unless you mean the extractor groove dimension. Her are the following dimensions from Cartridges of the World;
Neck Dia. .535"
Shoulder Dia. .615"
Base Dia. .620"
Rim Dia. .578"
Case Length 2.740"
As you can see, it is a rebated rim cartridge. I hope that helps you.

Yes Sir, I need the extractor groove dimension.

Max:

I have both new Horneber cases and Jamison cases so I put a caliper on them this morning. The rims are almost indentical, right around .572. However, there is a BIG difference in the measurement of the extractor groove. The Horneber cases measure .494 but the Jamison cases measures only .464. That's probably why you were having trouble with your gun.

I'll check them again this afternoon.

Dave

If you've got an e-mail address I can send you the CIP specs.

Wink:

Could you just tell us what the C.I.P. spec is for the extractor groove? If there is a problem, that is where it is. I put a caliper on the brass this morning and the rim diameter of the Horneber and Jamison brass is the same but there is big difference in the extractor grooves.

Dave

Dave, gee wizz, here I've got pdf tables of CIP specs for every cartridge in their file, a point and a click away, and I have to go look it up for you rather than sending this amazing file to you? OK, here goes but no guarantees that I'm reading the darn sketches correctly:

Rim = 14.61mm
Groove = 13.77mm
Groove angle = 34°39'36"

I assume that means the groove depth is 14.61 - 13.77 = 0.84mm

Like I said, I have no idea if I'm reading the sketch correctly.

Wink:

Thank you.

I just sent you a PM.

Dave

Dave, e-mail sent. Did it solve your problem?

Wink:

I am at work now. I'll check it when I get home and let you know. I have to look at the specs and the drawing. I am a little confused about the dimensions at this point. The Horneber brass and the Jamison brass are about the same dimensions EXCEPT for the depth of the extractor groove. There is about .030 difference with the Jamison brass being much deeper. I need to load some of the Jamison brass up and shoot it in my rifle and see how it works. I haven't had any trouble with the Horneber brass.

Thanks for your help. I will keep you and maxbear posted.

Dave

I sent all my 500 Jeffery ammo with Jamison brass back to the manufacturer. I do remember that my extractor groove measured .464

Apparantly a lot of folks have had problems with Jamison brass..I had some from Butch Searcy and I couldn't close the action on my 450-400 with it..the other stuff worked just fine...

CIP
extractor groove diameters:

500 Jeffery: 13.77mm = .542"

12.7x70 (500 Schuler) = 13.10mm = .516"

There has been some confusion over 500 Jeffery versus 500 Schuler in the past.

As long as the extractor groove diameter is smaller than the above max figures, it should not be a problem.

Is the rim thickness O.K.?

Jamison rims have been known to be too thick on the first batch of brass.

He recalls the brass and corrects it and gets it right on the second run.

Growing pains with starting up all this new stuff by Jamison does happen.

Stick by him and he will get you right.

RIP, thanks for posting those specifications.


So if the actual groove diameter of the Jamison 500 Jeffery case is .464 and the specifications are a written .542 , wouldn't this cause problems with the extractor?

maxbear,
Duane Wiebe observed ejection problems caused by the too-small extractor groove. I learned something.
See the latest 500 Jeffery brass trashing thread.