I have a 16/16/8x58R drilling with proof date of 2,07. It likewise has only the crown over N mark & does not say Nitro. Powder charge for the shot barrel is identical to yours but has 28.3gBl (1oz lead). It used 2 grams of Schultz powder as its service load. Mark for the rifle is same style, but I don't offhand recall the exact powder charge for the rifle. With this marking actual bullet weight is not given & was assumed to be standard for the caliber. It was proofed for use with Rifle Flake Powder & a Steel Jacked Bullet. Mine is a conventional top lever opener & was fitted for a scope. I have the mounts but not the scope. Selector for the rifle barrel is via a slide in the top tang (looks like a normal safety) with a side safety. Unfortunately the right barrel was bursted when I acquired it, though it was priced accordingly. It was a WWII bringback. The gentleman who had it was hunting with it one day with a heavy snowfall on the ground & shot at a rabbit. He felt he had likely inadvertently gotten some snow down the barrel.
Went & looked at this drilling. Powder charge is 2.0Gr or 30.86 grains. Caliber for the rifle barrel is marked as 172.28/59. Although the chamber is marked as 1mm longer all other dimensions for it fits the 8x58 Sauer. the 172.28 marking is the gauge size using standard specs for shotgun gauges. This calculates to a .300" diameter. In reality as best I have been able to determine this simply meant the bore would accept this size plug gage but not the next larger one of 156.14 gauge (.310"). I have measured the actual bore & it was very close to the .310" though I forget the exact number. Groove was .321".
Last edited by 2-piper; 11/13/15 11:59 AM. Reason: data added
