Ok, I've tried the @#!$% search function and cannot find the info I'm looking for.
Could someone help me with the datum diameter and the base to datum length for an 8x57 Mauser round?
I'm trying to do a poor boy head space check on a good BRNO 98k and believe the Winchester factory ammo I'm using is on the short side base to datum.
Any help would be apreciated.
Thanks
Covey16

Richardelli
I see your fine sight has grown since the last time I was there. I found the cartridge diagrams but didn't find the datum diameter or datum length. On an 8x57 is the datum point located somewhere along the shoulder as on many other bottleneck cases? I have a Stoney Point setup and calipers and am trying to use that to measure.I am looking for a number (as .223 Rem = .330" at datum or .243 win= .400 at datum) and a length. Thanks for the help so far.
Covey16

anybody?
I guess I'll have to go ask on the political forum.
Covey16

These guys my be able to look it up for you.

Pacific Tool and Gauge
PO BOX 2549 - 598 Ave C
White City, Oregon 97503
1-541-826-5808 FAX: 541-826-5304

per the Political forum
.38885" dia. at datum line

Covey16

Per NRA and William Davis Jr. book "Handloading", 1981 has what I believe are SAAMI toleranced drawings of chamber and cartridges.

The 8mm Mauser is is shown as .392" (9.96mm) on both cartridge and chamber.
The same book also shows the .223 as .330" (8.38mm)
The 7mm Mauser is .4294"
The 257 Roberts is .4294"
The 30-06 is .375"
The .308 is .400"

I have given the correct CIP data in the other forum.

Carcano

Clark ,Carcano91
Thanks for the response.
I guess the information on the political forum is like the forum itself, pretty danged close to true, but flavored by nationality,language and experience. .
Thanks again everyone.
Mauser's do divert gas thru the floorplate when they fail don't they. Just kidding . Loads will be mild.
Covey16