Daryl,

Thank you for the information.

A friend brought me this rifle. He had purchased it awhile ago as a .375 H&H. Since it was not, it just sat in his gunroom.

He asked me to determine the caliber and then sell it for him. I'll send him a link to this thread and see if he wants to load for it.

My intention with the fireforming is to have a single case to measure overall length. To come up with the 2.5", I held another belted mag next to the chamber cast using the front edge of the belt as a guide. Then used the calipers to go from neck on cast to rim on other case. That was why I had "Approx." in the length.