Huntington's is importing some brass from Gehmann's now. The images of the 7x66 I posted have Gehmann brass. I'm getting my 7x75R Vom Hofe Super Express brass and got my dies (RCBS) from Huntington's. The brass was made by Gehmann. So, Huntington's is a good place to start to try to find cases for the 7x66. My understanding is the brass is custom made and is made on order. It is spendy and takes a long time once the order is placed for Huntington to receive it. I would recommend calling Huntington's before having a rifle built for it first. The 7x66 appears to be a rebated rim cartridge (.512" rim and .545" body). Shoulder angle from Quickload is a touch over 30 degrees. Factory ammo is probably impossible to find stateside, but you might find some in Germany. Hagn was able to hunt down some 7x75R Vom Hofe Super Express factory rounds for my rifle. I wasn't able to locate any in the U.S., and I don't know if Hagn found the loaded ammunition in Canada or his German homeland.

QuickLoad program has the 7x66 cartridge programmed in its software, so you should be able to come up with some starting loads if you can find brass and work up from there for the particular rifle.

The case holds about 93 grains of water according to Quickload and is 2.598" in length. COAL is 3.307". Looks like a slow burning powder like Retumbo or H1000 might be the powders to work with for 160 grain bullets and keep pressures sane according to Quickload...

John,
The Super Express you mentioned might be the 7x75R Vom Hofe Super Express if it was a singleshot or double rifle since it is rimmed.