Would anyone know the name of the company that was at the Vintage Cup this year that was selling these gauges.I need to find this company name, so if anyone know please reply to this posting. I need to know the true bore size of a Russian made 4-bore pump shotgun, so i can get a few shells made.

Big Al,
You might get more info from gunshop.com they
were present at the Vintage Cup. I believe "jiri"
from this site is knowledgible of the company.
The web site is not in english . If you do a search on big bores or shotgunning the question has been asked before on this site. I would be interested in any info you may find.
Here is the site, http://www.hunt4u.ru/dake-4.htm