I picked up a nice German Drilling. Rifle barrel is marked as 9.3x72 normal. In researching the gun and the barrel markings, I have determined that it was built to handle smokeless loads. I had the gun checked out by a gunsmith, he gives the a-ok. I had him slug the barrel and it comes out as 0.363". I've found some new modern ammunition for it made by Sellier & Bellot. Bullets are copper jacket and 0.366" diameter. Any opinions on whether shooting this 0.366" is unsafe or will cause a problem?