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With the relative scarcity of .45ACP in the UK today, to get any sort of meaningful results may be a bridge too far.

Found some 45 ACP in the garage and had a quick measure up for you....

Case rim in mm Federal - 12.014mm, 12.0396mm, 12.0396mm, 12.0396mm, 12.065mm. Average 12.0396mm diameter
Winchester - 12.090mm, 12.0396mm, 12.065mm, 12.0396mm, 12.065mm. Average 12.05992mm diameter
CBC - 12.014mm (sorry, I could only find one)

All the above cases were brand new and unfired.
Measured in Imperial with Moore and Wright Micrometer and then converted to metric....

Hope this helps.

Mat

Indeed it does, ooman, indeed it does. Quite a variation in size between just those few brands.

Yes. I was suprised too and had to re-check them to make sure. If there is anything else you need let me know.
Regards.
Mat

Hmm.. a few more CBC would have been good however it does demonstrate a slightly smaller rim size with Federal which is interesting.

Thanks Mat

Very interesting indeed. Small enough, ovenpaa, or do we need to shrink 'em a bit more?

The Federal looks like it would work....

Mat are you at the Imperial, we are there on the 12/13/14th

I am on a course which finishes on the 12th. I might be able to come down on the Sunday if I can get a Pass from the Boss!!! What do yo need, can it be posted???
Mat

Come on oomans, get out there with your gauges !

I'll drag some out tonight, got about 5 or 6 different brands I think.