Hello Der Ami,

Thanks for the suggestions. 9.3x72R brass was not available to me. All sources I checked have it back-ordered. Also, the heads of the 9.3x72R that I measured on some cases I had, were about .008 undersize, and the rims were .475" dia instead of .498" diameter.

I just did a chamber cast of my barrels. Bores measures .350" dia and grooves measures .357" diameter. The Hornady 200g SP bullets, squirt through just fine.


How to Hunt Wisconsin Whitetail Deer with a Cannon