Who is chambeing rifles for Gibbs cartridges ?
I'm thinking of doing one. Would have to get a reamer.
I had all the data on the Gibbs cartridges from Rocky himself.. Mimo graphed sheets.. Gave it to a friend 25 years ago.. Sorry I gave it away.. His loads were HOT!!!!!
I've got the mimeograph sheets for the 8mm, got them from a local smith in Reedsburg. I've never even got close to the max loads he listed, I've read about how he tested them.