Thanks for the responses from all.

Originally Posted by skeettx
I have a box of fired Sellier & Bellot 7x57R brass
There are 18 fired cases in the original box

If you would like, I will send them to you.

Further, I can full length size any of the cases you wish before shipment.

You can most usually use a 303 Brit case and size it in a 7mm Mauser full length die
and trim to proper length.

Mike

p.s.

Headstamp
S&B 7x57R

Rim Thickness
.060

Rim Diameter
.525

Hi Mike, the only 7x57 brass I have is a partial box of Sellier & Bellot. I measured my cases and they range from .057" to .060" and vary a little even on the same case. Your measurement confirms my findings for S&B brass. I appreciate your offer to send me yours, however not necessary at this time.
I am hoping to find someone who had some other manufacturers bras such as Norma and there are of course others. If you have some and can measure them please do so and send me the data.

I can just chamber for the print dimension plus SAAMI headspace which would be .070", however their normal .007" headspace seems a bit much and that is why I wanted to see what actual variations of the cases run.